feat: 智能体发现和收藏功能

- 智能体界面顶部右侧添加搜索按钮（发现智能体）
- 点击进入发现页面，显示所有系统智能体
- 每个智能体显示简介、热度、类别
- 支持添加和收藏按钮
- 添加的智能体自动归类到对应类别
- 智能体界面顶部右侧添加收藏按钮（☆）
- 点击进入收藏夹页面，点击智能体进入对话
- 智能体长按弹出操作菜单（置顶、收藏、删除）
- 置顶、收藏、用户智能体配置持久化存储

www/style.css

@@ -83,21 +83,20 @@ body {
   color: var(--primary);
 }
 
-/* ==================== 页面通用头部 ==================== */
+/* ==================== 页面通用头部（紫色渐变） ==================== */
 
 .page-header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  padding: 16px;
-  background: white;
-  border-bottom: 1px solid var(--border-color);
+  padding: 12px 16px;
+  background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
+  color: white;
 }
 
 .page-header h1 {
-  font-size: 20px;
+  font-size: 18px;
   font-weight: 600;
-  color: var(--text-color);
 }
 
 /* ==================== 对话页面 ==================== */
@@ -108,29 +107,56 @@ body {
   height: 100%;
 }
 
+.chats-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
+  color: white;
+}
+
+.chats-header h1 {
+  font-size: 18px;
+  font-weight: 600;
+}
+
+.chats-header-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.chats-header-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 44px;
+  height: 44px;
+  background: rgba(255,255,255,0.95);
+  border: none;
+  border-radius: 50%;
+  color: var(--primary);
+  cursor: pointer;
+  transition: all 0.25s ease;
+  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+}
+
+.chats-header-btn:hover {
+  transform: scale(1.08);
+  box-shadow: 0 4px 16px rgba(102,126,234,0.4);
+  color: #5a67d8;
+}
+
+.chats-header-btn:active {
+  transform: scale(0.95);
+}
+
 .chats-content {
   flex: 1;
   padding: 16px;
   overflow-y: auto;
-}
-
-.new-chat-btn {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 40px;
-  height: 40px;
-  background: var(--primary);
-  border: none;
-  border-radius: 10px;
-  color: white;
-  cursor: pointer;
-  transition: all 0.2s;
-}
-
-.new-chat-btn:hover {
-  background: #5a67d8;
-  transform: scale(1.05);
+  background: #f5f5f5;
 }
 
 /* ==================== 智能体页面 ==================== */
@@ -141,10 +167,62 @@ body {
   height: 100%;
 }
 
+.agents-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
+  color: white;
+}
+
+.agents-header h1 {
+  font-size: 18px;
+  font-weight: 600;
+}
+
+.agents-header-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.agents-header-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 40px;
+  height: 40px;
+  background: rgba(255,255,255,0.95);
+  border: none;
+  border-radius: 50%;
+  color: var(--primary);
+  cursor: pointer;
+  transition: all 0.25s ease;
+  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+  font-size: 18px;
+}
+
+.agents-header-btn:hover {
+  transform: scale(1.08);
+  box-shadow: 0 4px 16px rgba(102,126,234,0.4);
+  color: #5a67d8;
+}
+
+.agents-header-btn.favorite-btn {
+  font-size: 20px;
+  font-weight: bold;
+}
+
+.agents-header-btn.favorite-btn.has-favorites {
+  color: #f59e0b;
+}
+
 .agents-content {
   flex: 1;
   padding: 16px;
   overflow-y: auto;
+  background: #f5f5f5;
 }
 
 .agents-section {
@@ -158,6 +236,28 @@ body {
   margin-bottom: 12px;
 }
 
+.section-title-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 12px;
+}
+
+.section-title-row .section-title {
+  margin-bottom: 0;
+}
+
+.section-more {
+  font-size: 14px;
+  color: var(--primary);
+  cursor: pointer;
+  transition: color 0.2s;
+}
+
+.section-more:hover {
+  color: #5a67d8;
+}
+
 .agents-grid {
   display: grid;
   grid-template-columns: repeat(2, 1fr);
@@ -174,6 +274,7 @@ body {
   border-radius: 12px;
   cursor: pointer;
   transition: all 0.2s;
+  position: relative;
 }
 
 .agent-card:hover {
@@ -182,6 +283,31 @@ body {
   transform: translateY(-2px);
 }
 
+.agent-card.pinned {
+  border-color: var(--primary);
+  background: rgba(102, 126, 234, 0.08);
+  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
+}
+
+.agent-card.favorite {
+  border-color: #f59e0b;
+  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.2);
+}
+
+.agent-pin-icon {
+  position: absolute;
+  top: 8px;
+  left: 8px;
+  font-size: 14px;
+}
+
+.agent-fav-icon {
+  position: absolute;
+  top: 8px;
+  right: 8px;
+  font-size: 14px;
+}
+
 .agent-avatar {
   font-size: 32px;
   margin-bottom: 8px;
@@ -200,6 +326,506 @@ body {
   text-align: center;
 }
 
+/* 智能体操作菜单 */
+.agent-action-menu {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  background: transparent;
+  display: none;
+  z-index: 1000;
+}
+
+.agent-action-menu.show {
+  display: block;
+}
+
+.agent-action-menu-content {
+  background: white;
+  border-radius: 16px 16px 0 0;
+  padding: 16px;
+  box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
+  animation: slideUp 0.2s ease;
+}
+
+.agent-action-item {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 14px 16px;
+  border-radius: 10px;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.agent-action-item:hover {
+  background: rgba(102, 126, 234, 0.1);
+}
+
+.agent-action-item svg {
+  color: var(--primary);
+}
+
+.agent-action-item span {
+  font-size: 16px;
+  color: var(--text-color);
+}
+
+.agent-action-item.delete-action svg,
+.agent-action-item.delete-action span {
+  color: #e53e3e;
+}
+
+.agent-action-item.delete-action:hover {
+  background: rgba(229, 62, 62, 0.1);
+}
+
+/* ==================== 智能体发现页面 ==================== */
+
+.agent-discover-page {
+  display: flex;
+  flex-direction: column;
+  height: 100vh;
+  height: 100dvh;
+  background: #f5f5f5;
+}
+
+.discover-header {
+  display: flex;
+  align-items: center;
+  padding: 12px 16px;
+  background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
+  color: white;
+}
+
+.discover-header h1 {
+  font-size: 18px;
+  font-weight: 600;
+  margin-left: 12px;
+}
+
+.back-btn-white {
+  background: transparent;
+  border: none;
+  color: white;
+  padding: 8px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+}
+
+.discover-content {
+  flex: 1;
+  padding: 16px;
+  overflow-y: auto;
+}
+
+.discover-search {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 12px 16px;
+  background: white;
+  border: 1px solid var(--border-color);
+  border-radius: 12px;
+  margin-bottom: 16px;
+}
+
+.discover-search svg {
+  color: var(--text-light);
+}
+
+.discover-search input {
+  flex: 1;
+  font-size: 16px;
+  border: none;
+  outline: none;
+  background: transparent;
+}
+
+.discover-section {
+  margin-bottom: 24px;
+}
+
+.discover-section-title {
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--text-color);
+  margin-bottom: 12px;
+}
+
+.discover-grid {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.discover-card {
+  display: flex;
+  flex-direction: column;
+  padding: 16px;
+  background: white;
+  border: 1px solid var(--border-color);
+  border-radius: 12px;
+  transition: all 0.2s;
+}
+
+.discover-card:hover {
+  border-color: var(--primary);
+  background: rgba(102, 126, 234, 0.05);
+}
+
+.discover-card-header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 8px;
+}
+
+.discover-avatar {
+  font-size: 32px;
+}
+
+.discover-card-info {
+  flex: 1;
+}
+
+.discover-name {
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--text-color);
+}
+
+.discover-meta {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-top: 4px;
+}
+
+.discover-category {
+  font-size: 12px;
+  color: var(--primary);
+  background: rgba(102, 126, 234, 0.1);
+  padding: 2px 8px;
+  border-radius: 4px;
+}
+
+.discover-heat {
+  font-size: 12px;
+  color: #f59e0b;
+}
+
+.discover-desc {
+  font-size: 14px;
+  color: var(--text-light);
+  margin-bottom: 12px;
+}
+
+.discover-actions {
+  display: flex;
+  gap: 8px;
+}
+
+.discover-action-btn {
+  flex: 1;
+  padding: 8px 12px;
+  border: 1px solid var(--border-color);
+  border-radius: 8px;
+  font-size: 14px;
+  color: var(--text-light);
+  background: white;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.discover-action-btn:hover {
+  border-color: var(--primary);
+  color: var(--primary);
+}
+
+.discover-action-btn.add-btn {
+  border-color: var(--primary);
+  color: var(--primary);
+}
+
+.discover-action-btn.add-btn:hover {
+  background: var(--primary);
+  color: white;
+}
+
+.discover-action-btn.add-btn.added {
+  background: rgba(102, 126, 234, 0.1);
+  color: var(--primary);
+  border-color: var(--primary);
+}
+
+.discover-action-btn.favorite-btn {
+  border-color: #f59e0b;
+  color: #f59e0b;
+}
+
+.discover-action-btn.favorite-btn:hover {
+  background: #f59e0b;
+  color: white;
+}
+
+.discover-action-btn.favorite-btn.favorited {
+  background: #f59e0b;
+  color: white;
+}
+
+/* ==================== 智能体收藏夹页面 ==================== */
+
+.agent-favorite-page {
+  display: flex;
+  flex-direction: column;
+  height: 100vh;
+  height: 100dvh;
+  background: #f5f5f5;
+}
+
+.favorite-header {
+  display: flex;
+  align-items: center;
+  padding: 12px 16px;
+  background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
+  color: white;
+}
+
+.favorite-header h1 {
+  font-size: 18px;
+  font-weight: 600;
+  margin-left: 12px;
+}
+
+.favorite-content {
+  flex: 1;
+  padding: 16px;
+  overflow-y: auto;
+}
+
+.empty-favorites {
+  text-align: center;
+  padding: 60px 20px;
+}
+
+.empty-icon {
+  font-size: 48px;
+  margin-bottom: 16px;
+  color: #f59e0b;
+}
+
+.empty-favorites p {
+  color: var(--text-light);
+  margin: 8px 0;
+}
+
+.empty-favorites .empty-tip {
+  font-size: 14px;
+  color: var(--primary);
+}
+
+.favorite-grid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: 12px;
+}
+
+.favorite-agent-card {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 16px;
+  background: white;
+  border: 1px solid #f59e0b;
+  border-radius: 12px;
+  cursor: pointer;
+  transition: all 0.2s;
+  position: relative;
+  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.15);
+}
+
+.favorite-agent-card:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.25);
+}
+
+.favorite-agent-avatar {
+  font-size: 32px;
+  margin-bottom: 8px;
+}
+
+.favorite-agent-name {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-color);
+  margin-bottom: 4px;
+}
+
+.favorite-agent-desc {
+  font-size: 12px;
+  color: var(--text-light);
+  text-align: center;
+}
+
+.favorite-agent-unfav {
+  position: absolute;
+  top: 8px;
+  right: 8px;
+  width: 24px;
+  height: 24px;
+  background: transparent;
+  border: none;
+  color: #f59e0b;
+  font-size: 16px;
+  cursor: pointer;
+  opacity: 0.6;
+  transition: opacity 0.2s;
+}
+
+.favorite-agent-unfav:hover {
+  opacity: 1;
+}
+
+/* 最近使用的智能体列表 */
+.recent-agents-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.recent-agent-item {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: white;
+  border: 1px solid var(--border-color);
+  border-radius: 10px;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.recent-agent-item:hover {
+  border-color: var(--primary);
+  background: rgba(102, 126, 234, 0.05);
+}
+
+.recent-agent-left {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.recent-agent-avatar {
+  font-size: 20px;
+}
+
+.recent-agent-name {
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--text-color);
+}
+
+.recent-agent-right {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  font-size: 12px;
+  color: var(--text-light);
+}
+
+.recent-agent-usage {
+  color: var(--primary);
+}
+
+.recent-agent-agent-name {
+  font-size: 12px;
+  color: var(--primary);
+  background: rgba(102, 126, 234, 0.1);
+  padding: 2px 8px;
+  border-radius: 4px;
+}
+
+/* 智能体历史页面 */
+.agent-history-page {
+  display: flex;
+  flex-direction: column;
+  height: 100vh;
+  height: 100dvh;
+}
+
+.back-btn-white {
+  background: transparent;
+  border: none;
+  color: white;
+  padding: 8px;
+  cursor: pointer;
+}
+
+.agent-history-content {
+  flex: 1;
+  padding: 16px;
+  overflow-y: auto;
+  background: #f5f5f5;
+}
+
+.agent-history-item {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 14px 16px;
+  background: white;
+  border: 1px solid var(--border-color);
+  border-radius: 10px;
+  margin-bottom: 8px;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.agent-history-item:hover {
+  border-color: var(--primary);
+  background: rgba(102, 126, 234, 0.05);
+}
+
+.agent-history-left {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.agent-history-avatar {
+  font-size: 24px;
+}
+
+.agent-history-name {
+  font-size: 15px;
+  font-weight: 500;
+  color: var(--text-color);
+}
+
+.agent-history-right {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  font-size: 13px;
+  color: var(--text-light);
+}
+
+.agent-history-usage {
+  color: var(--primary);
+}
+
+.agent-history-agent {
+  font-size: 12px;
+  color: var(--primary);
+  background: rgba(102, 126, 234, 0.1);
+  padding: 2px 8px;
+  border-radius: 4px;
+}
+
 /* ==================== 我的页面 ==================== */
 
 .profile-page {
@@ -211,6 +837,7 @@ body {
 .profile-content {
   flex: 1;
   padding: 16px;
+  background: #f5f5f5;
 }
 
 .profile-card {