Refactor login flow to use auth blueprint

Moved login route and logic from app.py to application/auth/routes.py under the 'auth' blueprint. Updated all references to the login route to use 'auth.login'. Added a dedicated login.html template under application/auth/templates. Adjusted login_required utility and default_return logic for consistency.

application/utils.py

@@ -1,11 +1,21 @@
 from flask_login import current_user
 from flask import redirect, url_for, flash
+from typing import Optional
 
 
 def login_required():
     if not current_user.is_authenticated:
         return redirect(url_for("auth.login"))
-    if current_user.must_change_password:
+        # if current_user.must_change_password:
         flash("You have to change your password")
         return redirect(url_for("auth.change_password"))
     return
+
+
+def default_return(next_page: Optional[str] = None):
+    return redirect(url_for("user.daily_log"))
+    if next_page:
+        return redirect(next_page)
+    if current_user.is_admin:
+        return redirect(url_for("admin.food_items"))
+    return redirect(url_for("dashboard"))