Fix persisted runtime camera toggles (#23734)

* preserve runtime camera toggles across config saves

Runtime toggles (camera on/off, detect, recordings, snapshots, audio) mutate the in-memory config and persist an override to .runtime_state.json. /api/config/set re-parses yaml into a fresh FrigateConfig and swaps it in, re-applying the yaml and profile layers but dropping the runtime layer, so a camera turned off from the dashboard came back on when an unrelated camera was saved. The workers were never notified, so it only appeared to come back: the UI streamed go2rtc while ffmpeg stayed stopped.

Extract the startup replay into Dispatcher.apply_runtime_state() and call it from config_set after the swap, re-layering the overrides and republishing them so workers and the UI reconverge.

Remove the broad clear_runtime_state() from ProfileManager.update_config, which is only ever reached from config_set: with a profile active, every save wiped every camera's overrides from disk. The broad wipe stays in activate_profile, where a real profile switch does invalidate the steady state. Saves still clear the keys they rewrote via clear_runtime_state_for_yaml_keys, so yaml wins where the two disagree.

* sync runtime config on camera delete and prune its overrides

Deleting a camera re-parsed yaml into a fresh FrigateConfig but only rebound app.frigate_config and genai_manager, never dispatcher.config (nor profile_manager, stats_emitter, or the runtime overrides). The API and the dispatcher then drifted onto different config objects until the next config save re-synced them, so the API reported surviving cameras with their yaml enabled state while the dispatcher still acted on their real runtime state.

Extract the config swap that config_set already does into a shared swap_runtime_config helper and call it from both sites, so every collaborator is rebound and the surviving cameras' runtime toggles are re-layered. Also drop the deleted camera's persisted overrides via a new clear_camera so a camera later added under the same name does not inherit them.

frigate/test/test_runtime_state.py

@@ -131,6 +131,25 @@ class TestRuntimeStatePersistence(unittest.TestCase):
         self.store.clear_all()
         self.assertEqual(self.store.load(), {})
 
+    def test_clear_camera_removes_only_that_camera(self) -> None:
+        self.store.set("front_door", "enabled", False)
+        self.store.set("front_door", "detect", False)
+        self.store.set("back_yard", "audio", False)
+
+        self.store.clear_camera("front_door")
+
+        self.assertEqual(self.store.load(), {"back_yard": {"audio": False}})
+
+    def test_clear_camera_is_noop_for_unknown_camera(self) -> None:
+        self.store.set("front_door", "enabled", False)
+        self.store.clear_camera("side_gate")
+        self.assertEqual(self.store.load(), {"front_door": {"enabled": False}})
+
+    def test_clear_camera_is_safe_when_file_missing(self) -> None:
+        # No prior set() calls, so the file does not exist
+        self.store.clear_camera("front_door")
+        self.assertEqual(self.store.load(), {})
+
 
 if __name__ == "__main__":
     unittest.main()