feat: add digital avatar management to admin dashboard

- Add avatars list page with pagination, search, status filter
- Add avatar detail dialog showing full info and config params
- Add on/off switch (active/inactive status toggle)
- Backend: avatar_service.py connects to digital avatar SQLite
- Backend: /api/avatars endpoints for list, detail, status update
- Sidebar menu item added below dashboard
- docker-compose: mount SQLite db and set AVATAR_DB_PATH env var

backend/app/api/__init__.py

@@ -1,6 +1,6 @@
 """API路由汇总"""
 from fastapi import APIRouter
-from app.api.endpoints import users, interactions, ai_models, dashboard, system, logs
+from app.api.endpoints import users, interactions, ai_models, dashboard, system, logs, avatars
 
 router = APIRouter()
 
@@ -10,3 +10,4 @@ router.include_router(ai_models.router, prefix="/ai-models", tags=["AI模型配
 router.include_router(dashboard.router, prefix="/dashboard", tags=["数据看板"])
 router.include_router(system.router, prefix="/system", tags=["系统设置"])
 router.include_router(logs.router, prefix="/logs", tags=["日志管理"])
+router.include_router(avatars.router, prefix="/avatars", tags=["数字分身管理"])

backend/app/api/endpoints/avatars.py

@@ -0,0 +1,65 @@
+"""数字分身管理 API 端点"""
+from fastapi import APIRouter, Query, HTTPException
+
+from app.schemas import ApiResponse
+from app.services.avatar_service import avatar_service, get_session
+
+router = APIRouter()
+
+
+@router.get("")
+def list_avatars(
+    page: int = Query(default=1, ge=1),
+    page_size: int = Query(default=20, ge=1, le=100),
+    keyword: str = Query(default=None),
+    status: str = Query(default=None),
+):
+    """分页查询所有数字分身"""
+    db = get_session()
+    try:
+        total, items = avatar_service.list_avatars(
+            db, page, page_size, keyword, status
+        )
+        return ApiResponse(
+            data={
+                "total": total,
+                "page": page,
+                "page_size": page_size,
+                "items": items,
+            }
+        )
+    finally:
+        db.close()
+
+
+@router.get("/{avatar_id}")
+def get_avatar(avatar_id: str):
+    """获取单个数字分身详情"""
+    db = get_session()
+    try:
+        data = avatar_service.get_avatar(db, avatar_id)
+        if not data:
+            raise HTTPException(status_code=404, detail="数字分身不存在")
+        return ApiResponse(data=data)
+    finally:
+        db.close()
+
+
+@router.put("/{avatar_id}/status")
+def update_avatar_status(avatar_id: str, body: dict):
+    """更新数字分身状态（开机/关机）"""
+    status = body.get("status")
+    if status not in ("active", "inactive", "training"):
+        raise HTTPException(
+            status_code=400,
+            detail="status 必须是 active、inactive 或 training",
+        )
+    db = get_session()
+    try:
+        data = avatar_service.update_status(db, avatar_id, status)
+        if not data:
+            raise HTTPException(status_code=404, detail="数字分身不存在")
+        msg = "已开机" if status == "active" else "已关机"
+        return ApiResponse(data=data, message=msg)
+    finally:
+        db.close()