feat: unify API responses and global error handling

- add app/core/response.py
- add global exception handlers and logging in app/__init__.py
- normalize validation messages and clean ValueError prefixes
- centralize success_response/error_response and update user_views
- write logs to logs/app.log

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

FastApi/app/__init__.py

@@ -7,6 +7,7 @@ import logging
 import os
 from logging.handlers import RotatingFileHandler
 import traceback
+import re
 from fastapi import FastAPI, Request, HTTPException
 from fastapi.exceptions import RequestValidationError
 from fastapi.responses import JSONResponse
@@ -40,6 +41,13 @@ if not logger.handlers:
     logger.setLevel(logging.INFO)
 
 
+def _clean_message(s: str) -> str:
+    """Normalize exception messages by removing wrapper prefixes like "ValueError,"."""
+    if not s:
+        return s
+    return re.sub(r'^\s*(?:ValueError|Value\s*error)[:,]?\s*', '', str(s), flags=re.I)
+
+
 def create_app():
     app = FastAPI()
     register_mobile_routes(app)
@@ -57,7 +65,8 @@ def create_app():
                 loc_parts = loc
             # join remaining location parts into a dotted path for readability
             loc_str = ".".join([str(p) for p in loc_parts if p is not None]) if loc_parts else ""
-            errors.append({"field": loc_str, "message": e.get("msg", "")})
+            cleaned_msg = _clean_message(e.get("msg", ""))
+            errors.append({"field": loc_str, "message": cleaned_msg})
 
         # Log validation details for debugging
         logger.info("Validation error for %s: %s", request.url.path, errors)
@@ -83,10 +92,12 @@ def create_app():
         if isinstance(exc, ValueError):
             # Log with stack for debugging
             tb = "".join(traceback.format_exception(type(exc), exc, exc.__traceback__))
-            logger.warning("ValueError on %s: %s\n%s", request.url.path, str(exc), tb)
+            raw_msg = str(exc) or ""
+            cleaned_msg = _clean_message(raw_msg)
+            logger.warning("ValueError on %s: %s\n%s", request.url.path, cleaned_msg, tb)
             return JSONResponse(
                 status_code=400,
-                content=error_response(msg=str(exc) or "参数错误", code=400),
+                content=error_response(msg=cleaned_msg or "参数错误", code=400),
             )
 
         # Generic fallback to avoid leaking internal stack traces