fix: 普通对话使用后台配置的LLM

backend/app.py

@@ -1345,10 +1345,20 @@ def get_frontend_config():
     conn = get_db()
     cursor = conn.cursor()
     
-    # 获取默认LLM配置
-    cursor.execute('SELECT * FROM llm_configs WHERE is_default=1 AND is_active=1 LIMIT 1')
+    # 先获取默认对话配置
+    cursor.execute('SELECT * FROM chat_configs WHERE is_default=1 LIMIT 1')
+    chat_config = cursor.fetchone()
+    
+    # 根据对话配置中的 llm_config_id 获取对应的 LLM 配置
+    llm_config_id = chat_config['llm_config_id'] if chat_config else 1
+    cursor.execute('SELECT * FROM llm_configs WHERE id=?', (llm_config_id,))
     llm = cursor.fetchone()
     
+    # 如果找不到对应的LLM配置，使用默认的
+    if not llm:
+        cursor.execute('SELECT * FROM llm_configs WHERE is_default=1 LIMIT 1')
+        llm = cursor.fetchone()
+    
     # 获取默认工具配置（搜索等）
     cursor.execute('SELECT * FROM tool_configs WHERE is_default=1 AND is_active=1')
     tools = [dict(row) for row in cursor.fetchall()]
@@ -1361,10 +1371,6 @@ def get_frontend_config():
     cursor.execute('SELECT agent_id, name, avatar, category, description, system_prompt, heat, tags, enable_tools FROM agents WHERE is_online=1 AND is_active=1')
     agents = [dict(row) for row in cursor.fetchall()]
     
-    # 获取默认对话配置
-    cursor.execute('SELECT * FROM chat_configs WHERE is_default=1 LIMIT 1')
-    chat_config = cursor.fetchone()
-    
     # 获取系统配置
     cursor.execute('SELECT key, value FROM system_configs')
     system = {row['key']: row['value'] for row in cursor.fetchall()}