fix: v1.4.1 - 三项优化

1. 选模型后参数自适应调整:
   - n_gpu_layers 设为模型实际层数(而非'all')
   - 多卡时 split_mode 设为 tensor
   - tensor_split 按各卡显存比例自动计算
   - 增减/切换显卡时也自动更新 tensor_split

2. 模型路径为空时红色线框标记

3. 参数值非默认时用橙色线框标记(非红非绿)

static/css/style.css

@@ -378,6 +378,8 @@ header h1 {
     transition: border-color 0.15s;
 }
 .param-item:hover { border-color: var(--accent2); }
+.param-item.param-empty { border-color: var(--accent); border-width: 2px; }
+.param-item.param-changed { border-color: #e9c46a; }
 .param-item.modified { border-color: var(--accent2); }
 
 /* keep old .modified for backwards compat but remove red styling */

static/js/main.js

@@ -79,9 +79,9 @@ function renderGpuSlots() {
     document.getElementById('btn-add-gpu').style.display = state.gpuSlots.length >= 4 ? 'none' : 'block';
     updateEstimate();
 }
-function addGpuSlot() { if (state.gpuSlots.length >= 4) return; const dg = state.gpus.find(g => g.name === 'RTX 3090') || state.gpus[0]; state.gpuSlots.push({ ...dg }); renderGpuSlots(); generateCommand(); }
-function removeGpuSlot(i) { state.gpuSlots.splice(i, 1); renderGpuSlots(); generateCommand(); }
-function updateGpuSlot(i, name) { const g = state.gpus.find(g => g.name === name); if (g) state.gpuSlots[i] = { ...g }; renderGpuSlots(); generateCommand(); }
+function addGpuSlot() { if (state.gpuSlots.length >= 4) return; const dg = state.gpus.find(g => g.name === 'RTX 3090') || state.gpus[0]; state.gpuSlots.push({ ...dg }); renderGpuSlots(); if (state.selectedModel) applyModelDefaults(state.selectedModel); generateCommand(); }
+function removeGpuSlot(i) { state.gpuSlots.splice(i, 1); renderGpuSlots(); if (state.gpuSlots.length > 1) { if (state.selectedModel) applyModelDefaults(state.selectedModel); } else { state.paramValues['split_mode'] = state.params.find(p=>p.param_key==='split_mode')?.default_value || 'layer'; state.paramValues['tensor_split'] = state.params.find(p=>p.param_key==='tensor_split')?.default_value || ''; } generateCommand(); }
+function updateGpuSlot(i, name) { const g = state.gpus.find(g => g.name === name); if (g) state.gpuSlots[i] = { ...g }; renderGpuSlots(); if (state.gpuSlots.length > 1 && state.selectedModel) applyModelDefaults(state.selectedModel); generateCommand(); }
 
 // ===== Model Selection =====
 function filterBaseModels() {
@@ -153,15 +153,29 @@ function applyModelDefaults(m) {
     if (m.default_ctx && m.default_ctx > 0) {
         state.paramValues['ctx_size'] = String(m.default_ctx);
     }
-    // Set n_gpu_layers to 'all' for GPU mode
-    if (state.mode === 'gpu') {
-        state.paramValues['n_gpu_layers'] = 'all';
+    // Set n_gpu_layers to model's layer count (not 'all', use actual number)
+    if (m.layers && m.layers > 0) {
+        state.paramValues['n_gpu_layers'] = String(m.layers);
+    }
+    // Multi-GPU: set split_mode to tensor, compute tensor_split by VRAM ratio
+    if (state.gpuSlots.length > 1) {
+        state.paramValues['split_mode'] = 'tensor';
+        updateTensorSplit();
     }
     // Update param UI if currently visible
     renderParams();
     generateCommand();
 }
 
+function updateTensorSplit() {
+    if (state.gpuSlots.length <= 1) return;
+    const totalVram = state.gpuSlots.reduce((s, g) => s + (g.vram_mb || 0), 0);
+    if (totalVram > 0) {
+        const ratios = state.gpuSlots.map(g => (g.vram_mb / totalVram).toFixed(2));
+        state.paramValues['tensor_split'] = ratios.join(',');
+    }
+}
+
 // ===== Parameter Rendering =====
 function switchTab(cat) {
     state.currentTab = cat;
@@ -230,7 +244,13 @@ function renderParams() {
 
 function renderParamItem(p) {
     const val = state.paramValues[p.param_key];
-    const mc = '';
+    // Determine item class: empty-required (red), modified (orange), or normal
+    let itemClass = '';
+    if (p.param_key === 'model' && (!val || val.trim() === '')) {
+        itemClass = 'param-empty';
+    } else if (isParamModified(p, val)) {
+        itemClass = 'param-changed';
+    }
     const vb = p.affects_vram ? '<span class="vram-badge">⚡显存</span>' : '';
     // Show both short and long flag
     const shortFlag = p.short_flag || '';
@@ -256,7 +276,7 @@ function renderParamItem(p) {
         inp = `<input type="text" value="${val}" onchange="setParam('${p.param_key}', this.value)" data-key="${p.param_key}">`;
     }
     const uh = p.unit ? `<span class="param-unit">${p.unit}</span>` : '';
-    return `<div class="param-item ${mc}" data-key="${p.param_key}">${flagHtml}${vb}<span class="param-desc-text">${p.description}</span>${inp}${uh}</div>`;
+    return `<div class="param-item ${itemClass}" data-key="${p.param_key}">${flagHtml}${vb}<span class="param-desc-text">${p.description}</span>${inp}${uh}</div>`;
 }
 
 function isParamModified(p, val) {