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/reactions.py

@@ -5,7 +5,7 @@ from datetime import datetime, timezone
 from fastapi import APIRouter, Request, Form
 from fastapi.responses import RedirectResponse, JSONResponse
 from devplacepy.database import get_table, db, _now_iso
-from devplacepy.utils import generate_uid, require_user
+from devplacepy.utils import generate_uid, require_user, track_action
 from devplacepy.models import ReactionForm
 from devplacepy.services.audit import record as audit
 
@@ -61,6 +61,8 @@ async def react(
         added = True
 
     reaction_event = "reaction.add" if added else "reaction.remove"
+    if added:
+        track_action(user["uid"], "reaction")
 
     audit.record(
         request,