Miscellaneous fixes (#23032)

* ensure embeddings process restarts after maintainer thread crash

* add docs link to media sync settings

* fix color

Co-authored-by: Copilot <copilot@github.com>

* match link color with other sections

* ensure recording staleness threshold scales with segment_time

* docs tweak

* Fix llama.cpp media marker

* Fix gemini tools call

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

frigate/embeddings/__init__.py

@@ -4,6 +4,7 @@ import base64
 import json
 import logging
 import os
+import sys
 import threading
 from json.decoder import JSONDecodeError
 from multiprocessing.synchronize import Event as MpEvent
@@ -52,6 +53,14 @@ class EmbeddingProcess(FrigateProcess):
             self.stop_event,
         )
         maintainer.start()
+        maintainer.join()
+
+        # If the maintainer thread exited but no shutdown was requested, it
+        # crashed. Surface as a non-zero exit so the watchdog restarts us
+        # instead of treating the silent thread death as a clean shutdown.
+        if not self.stop_event.is_set():
+            logger.error("Embeddings maintainer thread exited unexpectedly")
+            sys.exit(1)
 
 
 class EmbeddingsContext: