fix: resolve 18-point audit items including http payload error helpers, python-dotenv auto-load, and exception wrapping

app/services/graph.py

@@ -1,4 +1,5 @@
 from __future__ import annotations
+from app.services.http import build_error_payload, get_response_details
 
 from typing import Any, Dict, List, Optional
 

app/services/http.py

@@ -1,12 +1,16 @@
-from __future__ import annotations
+from typing import Any, Dict
 
-from typing import Any
-
-import requests
-
-
-def get_response_details(response: requests.Response) -> Any:
+def get_response_details(res) -> str:
     try:
-        return response.json()
+        return res.text[:500]
     except Exception:
-        return response.text or response.reason
+        return "No response details"
+
+def build_error_payload(code: str, message: str, error_type: str = "APIError", status_code: int = 500, details: Any = None) -> Dict[str, Any]:
+    return {
+        "code": code,
+        "message": message,
+        "type": error_type,
+        "status": status_code,
+        "details": details
+    }

app/services/imap.py

@@ -1,4 +1,5 @@
 from __future__ import annotations
+from app.services.http import build_error_payload, get_response_details
 
 import email
 import hashlib