fix: access Session object attributes correctly in login

Session is a Supabase object, not a dict. Changed from .get() to direct attribute access.
Fixes 'Session' object has no attribute 'get' error during login.

src/app/api/v1/auth.py

@@ -400,9 +400,10 @@ async def login(request: Request, response: Response, credentials: LoginRequest,
         
         logger.info(f"User logged in successfully: {credentials.email}")
         
-        # Get refresh token from auth response
-        refresh_token = auth_response.get("session", {}).get("refresh_token")
-        expires_in = auth_response.get("session", {}).get("expires_in", 3600)
+        # Get refresh token from auth response session object
+        session = auth_response.get("session")
+        refresh_token = session.refresh_token if session else None
+        expires_in = session.expires_in if session else 3600
         
         return {
             "access_token": access_token,