chore(dead-code): fix prod image, drop orphaned code, correct delete_rule doc

Drift-audit Group 7 (renamed/removed lingers) + Group 5 #9:

- docker-compose.prod.yml pulled fabledassistant:latest, a tag CI stopped
  publishing after the rename. Point it at fabledscribe:latest (the name CI
  and quickstart use). The internal DB name stays fabledassistant by design.
- Remove the unused hard-delete delete_note imports from the notes and tasks
  route modules (they delete via trash; the import was an attractive nuisance
  that bypassed soft-delete).
- delete_rule MCP tool: docstring/warning said 'permanently delete' but the
  body moves the rule to recoverable trash. Corrected to match.
- Delete services/calendar_sync.py: fully orphaned (zero importers) and it
  read Config attrs that no longer exist, so any re-wiring would crash.
- Remove dead services: notes.search_notes_for_context and logging.log_generation
  (zero callers; log_generation wrote a 'generation' category no stats/UI surface).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/fabledassistant/services/logging.py

@@ -59,26 +59,6 @@ async def log_usage(
         await session.commit()
 
 
-async def log_generation(
-    user_id: int,
-    conv_id: int,
-    model: str,
-    timing: dict,
-) -> None:
-    """Persist per-generation timing breakdown to app_logs for benchmarking."""
-    async with async_session() as session:
-        log = AppLog(
-            category="generation",
-            user_id=user_id,
-            action="generation",
-            endpoint=f"/chat/conversations/{conv_id}",
-            duration_ms=timing.get("total_ms"),
-            details=json.dumps({"model": model, "conv_id": conv_id, **timing}),
-        )
-        session.add(log)
-        await session.commit()
-
-
 async def log_error(
     user_id: int | None = None,
     username: str | None = None,