```

feat(api): 添加万川平台模型配置获取和同步功能

- 新增 getWanchuanModelConfig 函数，按模型编码获取平台模型配置
- 新增 syncWanchuanModelToSettings 函数，从万川平台拉取模型配置并写入后端 AI 设置
- 支持按用途分多个模型编码（generic/vision/voice）分别同步配置
- 配置失败时跳过对应字段，不影响其他模型同步

feat(settings): 重构AI模型配置界面支持多模块分组

- 将AI配置按话题分析、报告生成、视觉、语音四个模块分组展示
- 每个模块独立配置接口地址、密钥和模型名称
- 添加从万川平台获取配置的按钮和同步功能
- 优化配置状态指示和错误提示信息

refactor(config): 扩展AI配置支持独立的语音视觉报告网关

- 新增 voice_base_url/voice_api_key 配置项
- 新增 vision_base_url/vision_api_key 配置项
- 新增 summary_base_url/summary_api_key 配置项
- 留空时回退到 ai_base_url/ai_api_key 兼容单网关场景

refactor(http): 统一使用共享HTTP客户端减少连接开销

- 替换各处 httpx.AsyncClient 为 shared_client
- 在 lifespan 中正确关闭共享客户端资源
- 优化 get_current_wxid 和 health 检查中的HTTP请求

refactor(ai): 按用途缓存AI客户端支持不同网关配置

- 重构 get_openai_client 支持按(base_url, api_key)缓存
- 新增 get_client_for 函数按用途获取对应客户端
- 支持语音、视觉、报告等不同用途使用独立网关和密钥
```

chatlog_fastAPI/main.py

@@ -7,7 +7,6 @@ from contextlib import asynccontextmanager
 import asyncio
 import logging
 from pathlib import Path
-import httpx
 from database import get_active_db_path, get_current_wxid, init_db, reset_wxid_cache, update_db_path
 from scheduler import start_scheduler
 from config import settings
@@ -15,6 +14,7 @@ from routers import search, groups, topics, knowledge, ai, sse, files, chatlog_p
 from routers import settings as settings_router
 from services.chatlog_context import get_chatlog_context, update_chatlog_context
 from services.media_resolver import diagnose_media
+from services.http_client import shared_client, close_shared_client
 
 log = logging.getLogger(__name__)
 
@@ -49,6 +49,7 @@ async def lifespan(app: FastAPI):
         await task
     except asyncio.CancelledError:
         pass
+    await close_shared_client()
 
 app = FastAPI(lifespan=lifespan)
 
@@ -79,11 +80,11 @@ async def health():
     chatlog_ok = False
     chatlog_error = ""
     try:
-        async with httpx.AsyncClient(timeout=3.0, trust_env=False) as client:
-            resp = await client.get(f"{settings.chatlog_base_url}/api/v1/session", params={"limit": 1, "format": "json"})
-            chatlog_ok = resp.status_code == 200
-            if not chatlog_ok:
-                chatlog_error = f"HTTP {resp.status_code}"
+        client = shared_client()
+        resp = await client.get(f"{settings.chatlog_base_url}/api/v1/session", params={"limit": 1, "format": "json"}, timeout=3.0)
+        chatlog_ok = resp.status_code == 200
+        if not chatlog_ok:
+            chatlog_error = f"HTTP {resp.status_code}"
     except Exception as e:
         chatlog_error = str(e)
 
@@ -101,6 +102,9 @@ async def health():
 @app.post("/api/system/refresh-account")
 async def refresh_account():
     reset_wxid_cache()
+    # 用户主动点“重新识别账号”=要最新数据，无条件清掉头像/contact 库缓存
+    from services.chatlog_client import chatlog_client
+    chatlog_client.reset_account_cache()
     db_path = await update_db_path(force=True)
     wxid = await get_current_wxid()
     return {"ok": True, "wxid": wxid, "db_path": db_path}