fix: resolve Google login hydration mismatch and dynamic env load

routes/auth_routes.py

@@ -620,6 +620,7 @@ async def google_auth_v1(body: GoogleAuthRequest):
     try:
         user = get_or_create_google_user(email=email, name=name, avatar_url=avatar_url)
     except Exception as exc:
+        logger.exception("Google authentication failed in get_or_create_google_user")
         return JSONResponse(
             status_code=500,
             content={"error": "USER_CREATE_FAILED", "message": str(exc)},
@@ -641,6 +642,21 @@ async def google_auth_v1(body: GoogleAuthRequest):
     )
 
 
+@router_v1.get("/config")
+async def get_auth_config():
+    """Retrieve public configuration settings, such as Google Client ID."""
+    return JSONResponse(
+        status_code=200,
+        content={
+            "data": {
+                "google_client_id": os.getenv("GOOGLE_CLIENT_ID", ""),
+                "google_auth_enabled": bool(os.getenv("GOOGLE_CLIENT_ID", "").strip()),
+            },
+            "meta": {},
+        },
+    )
+
+
 @router_v1.post("/refresh")
 async def refresh_v1(request: Request):
     """Refresh tokens (API v1) — accepte refresh_token en corps, retourne nouvel access_token et refresh_token."""