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/follow.py

@@ -9,6 +9,7 @@ from devplacepy.utils import (
     require_user,
     create_notification,
     award_rewards,
+    track_action,
     XP_FOLLOW,
 )
 from devplacepy.responses import action_result
@@ -54,6 +55,7 @@ async def follow_user(request: Request, username: str):
         f"/profile/{user['username']}",
     )
     award_rewards(target["uid"], XP_FOLLOW)
+    track_action(user["uid"], "follow")
 
     logger.info(f"{user['username']} followed {username}")
     audit.record(