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/uploads.py

@@ -7,7 +7,7 @@ from fastapi import APIRouter, Form, Request
 from fastapi.responses import JSONResponse
 from devplacepy.database import get_table, get_int_setting
 from devplacepy.models import UploadUrlForm
-from devplacepy.utils import require_user_api, is_admin
+from devplacepy.utils import require_user_api, is_admin, track_action
 from devplacepy.attachments import (
     store_attachment,
     store_attachment_from_url,
@@ -64,6 +64,7 @@ async def upload_file(request: Request):
         summary=f"{user['username']} uploaded attachment {file.filename}",
         links=[audit.attachment_link(result.get("uid"), file.filename)],
     )
+    track_action(user["uid"], "upload")
     return JSONResponse(result, status_code=201)