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_config_util.py

@@ -0,0 +1,55 @@
+"""Tests for the shared runtime config swap helper."""
+
+import unittest
+from unittest.mock import MagicMock
+
+from frigate.api.config_util import swap_runtime_config
+
+
+class TestSwapRuntimeConfig(unittest.TestCase):
+    """swap_runtime_config rebinds every collaborator to the new config."""
+
+    def _make_app(self) -> MagicMock:
+        app = MagicMock()
+        app.dispatcher.comms = [MagicMock(), MagicMock()]
+        return app
+
+    def test_rebinds_all_references(self) -> None:
+        app = self._make_app()
+        config = MagicMock(name="new_config")
+
+        swap_runtime_config(app, config)
+
+        self.assertIs(app.frigate_config, config)
+        app.genai_manager.update_config.assert_called_once_with(config)
+        app.profile_manager.update_config.assert_called_once_with(config)
+        self.assertIs(app.stats_emitter.config, config)
+        self.assertIs(app.dispatcher.config, config)
+        for comm in app.dispatcher.comms:
+            self.assertIs(comm.config, config)
+
+    def test_reapplies_runtime_state_after_swap(self) -> None:
+        app = self._make_app()
+        config = MagicMock(name="new_config")
+
+        swap_runtime_config(app, config)
+
+        # the swap rebuilds cameras from yaml, so overrides must be re-layered
+        app.dispatcher.apply_runtime_state.assert_called_once_with()
+
+    def test_tolerates_missing_optional_collaborators(self) -> None:
+        app = MagicMock()
+        app.profile_manager = None
+        app.stats_emitter = None
+        app.dispatcher = None
+        config = MagicMock(name="new_config")
+
+        # must not raise when the optional collaborators are absent
+        swap_runtime_config(app, config)
+
+        self.assertIs(app.frigate_config, config)
+        app.genai_manager.update_config.assert_called_once_with(config)
+
+
+if __name__ == "__main__":
+    unittest.main()