fix(backend): Refactor OIDC callback and auth dependency to correctly handle cookies and prefix all API routes with /api/v1.

backend/src/ea_chatbot/api/dependencies.py

@@ -25,9 +25,8 @@ oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/v1/auth/login", auto_error=Fa
 
 async def get_current_user(request: Request, token: str = Depends(oauth2_scheme)) -> User:
     """Dependency to get the current authenticated user from the JWT token (cookie or header)."""
-    # Try getting token from cookie first
-    if not token:
-        token = request.cookies.get("access_token")
+    # Prioritize cookie, fallback to header
+    token = request.cookies.get("access_token") or token
 
     credentials_exception = HTTPException(
         status_code=status.HTTP_401_UNAUTHORIZED,