🔧(summary) extract hardcoded title to configurable setting

Replace hardcoded title with configurable option to enable custom
branding for different deployments of the microservice.

src/summary/summary/core/celery_worker.py

@@ -315,7 +315,7 @@ def process_audio_transcribe_summarize_v2(
     metadata_manager.track_transcription_metadata(task_id, transcription)
 
     data = {
-        "title": "Transcription",
+        "title": settings.document_title,
         "content": formatted_transcription,
         "email": email,
         "sub": sub,

src/summary/summary/core/config.py

@@ -45,6 +45,9 @@ class Settings(BaseSettings):
     webhook_api_token: str
     webhook_url: str
 
+    # Output related settings
+    document_title: Optional[str] = "Transcription"
+
     # Sentry
     sentry_is_enabled: bool = False
     sentry_dsn: Optional[str] = None