Control settings tabs, hide default creds hint after change, LAN passwordless login.

Co-authored-by: Cursor <cursoragent@cursor.com>

control/backend/app/config.py

@@ -33,6 +33,8 @@ class ControlSettings(BaseSettings):
     control_poll_interval_sec: int = 8
     control_http_timeout_sec: float = 12.0
     control_port: int = 5160
+    # "1"/"0"：局域网客户端免密登录
+    control_lan_auth_bypass: str = "0"
 
     @property
     def db_path(self) -> Path:
@@ -40,6 +42,22 @@ class ControlSettings(BaseSettings):
             return Path(self.control_db_path)
         return _control_root() / "data" / "control.db"
 
+    @property
+    def lan_auth_bypass(self) -> bool:
+        return self.control_lan_auth_bypass.strip().lower() in (
+            "1",
+            "true",
+            "yes",
+            "on",
+        )
+
+    @property
+    def is_default_credentials(self) -> bool:
+        return (
+            self.control_auth_username.strip() == "admin"
+            and self.control_auth_password == "admin123"
+        )
+
 
 @lru_cache
 def get_control_settings() -> ControlSettings: