🔧(summary) add settings to disable summary feature entirely

Introduce FastAPI settings configuration option to completely disable
the summary feature. This improves developer experience by allowing
developers to skip summary-related setup when not needed for their
workflow.

src/summary/summary/core/celery_worker.py

@@ -318,7 +318,10 @@ def process_audio_transcribe_summarize_v2(
 
     metadata_manager.capture(task_id, settings.posthog_event_success)
 
-    if analytics.is_feature_enabled("summary-enabled", distinct_id=sub):
+    if (
+        analytics.is_feature_enabled("summary-enabled", distinct_id=sub)
+        and settings.is_summary_enabled
+    ):
         logger.info("Queuing summary generation task.")
         summarize_transcription.apply_async(
             args=[formatted_transcription, email, sub, title],

src/summary/summary/core/config.py

@@ -57,6 +57,9 @@ class Settings(BaseSettings):
     )
     summary_title_template: Optional[str] = "Résumé de {title}"
 
+    # Summary related settings
+    is_summary_enabled: bool = True
+
     # Sentry
     sentry_is_enabled: bool = False
     sentry_dsn: Optional[str] = None