feat: add backup CLI commands, AI correction/modifier services, and timezone-aware date display

- Add `devplace backups` CLI subcommands (list, run, prune, clear) with job enqueueing and orphan cleanup
- Introduce `BACKUPS_DIR` and `BACKUP_STAGING_DIR` config paths for backup storage
- Implement `schedule_correction` and `schedule_modification` calls in content creation, comment creation, and comment editing flows
- Add `DEFAULT_CORRECTION_PROMPT` and `DEFAULT_MODIFIER_PROMPT` config constants for AI content processing
- Document timezone-aware date display using `local_dt`/`dt_ago` Jinja globals with client-side `Intl` localization
- Update README with AI content correction/modifier support in direct messages via `@ai` inline instructions
- Add `track_action(user["uid"], "vote")` call on upvote in `apply_vote`

devplacepy/routers/profile/__init__.py

@@ -2,12 +2,20 @@
 
 from fastapi import APIRouter
 
-from devplacepy.routers.profile import customization, index, notifications
+from devplacepy.routers.profile import (
+    ai_correction,
+    ai_modifier,
+    customization,
+    index,
+    notifications,
+)
 from devplacepy.routers.profile.usage import _ai_quota
 
 router = APIRouter()
 router.include_router(index.router)
 router.include_router(customization.router)
 router.include_router(notifications.router)
+router.include_router(ai_correction.router)
+router.include_router(ai_modifier.router)
 
 __all__ = ["router", "_ai_quota"]