fix: convert AUTH_FILE to getter and disable rate limiting in test suite to fix CI failures

dashboard/backend/auth_service.py

@@ -100,7 +100,8 @@ async def get_current_user_ws(token: str):
     return user_from_access_token(token, include_auth_header=False)
 
 # TOTP Persistence
-AUTH_FILE = config.VOLUME_ROOT + "/docker/nas-dashboard/auth.json"
+def get_auth_file():
+    return config.VOLUME_ROOT + "/docker/nas-dashboard/auth.json"
 import json, os
 import base64
 import hashlib
@@ -127,7 +128,7 @@ def _update_auth_data(mutator):
     with _auth_lock:
         data = _load_auth_data()
         result = mutator(data)
-        _atomic_json_write(AUTH_FILE, data)
+        _atomic_json_write(get_auth_file(), data)
         return result
 
 def _get_fernet():
@@ -162,15 +163,16 @@ def _decrypt(ciphertext: str) -> str:
 def _load_auth_data():
     with _auth_lock:
         try:
-            if os.path.exists(AUTH_FILE):
-                with open(AUTH_FILE, "r") as f:
+            auth_path = get_auth_file()
+            if os.path.exists(auth_path):
+                with open(auth_path, "r") as f:
                     return json.load(f)
         except Exception:
             pass
         return {}
 
 def _save_auth_data(data):
-    _atomic_json_write(AUTH_FILE, data)
+    _atomic_json_write(get_auth_file(), data)
 
 def load_totp_secret():
     encrypted = _load_auth_data().get("totp_secret", "")