perf: 前端路由级代码分割+资源长期缓存；后端列表查询封顶与N+1修复；Dockerfile将依赖烤入.venv根治升级崩溃

backend/python/app/api/admin/services.py

@@ -68,7 +68,7 @@ async def get_services(
     if status:
         query = query.filter(ValueAddedService.status == status)
 
-    services = query.order_by(ValueAddedService.created_at.desc()).all()
+    services = query.order_by(ValueAddedService.created_at.desc()).limit(1000).all()
     result = []
     for s in services:
         result.append({
@@ -244,7 +244,7 @@ async def get_custom_requests(
     if status:
         query = query.filter(CustomServiceRequest.status == status)
 
-    requests = query.order_by(CustomServiceRequest.created_at.desc()).all()
+    requests = query.order_by(CustomServiceRequest.created_at.desc()).limit(1000).all()
     result = []
     for r in requests:
         # 查询用户名
@@ -326,10 +326,13 @@ async def get_custom_orders(
     if status:
         query = query.filter(CustomServiceOrder.status == status)
 
-    orders = query.order_by(CustomServiceOrder.created_at.desc()).all()
+    orders = query.order_by(CustomServiceOrder.created_at.desc()).limit(1000).all()
+    # 批量获取用户，避免逐行查询（N+1）
+    _uids = [o.user_id for o in orders if o.user_id]
+    _users = {u.id: u for u in db.query(User).filter(User.id.in_(_uids)).all()} if _uids else {}
     result = []
     for o in orders:
-        user = db.query(User).filter(User.id == o.user_id).first()
+        user = _users.get(o.user_id)
         result.append({
             "id": o.id,
             "user_id": o.user_id,