feat: implement /recover command for listing and recovering soft-deleted bounties

- Add recover_bounty method to BountyService (admin-only)
- Add cmd_recover handler for listing and recovering deleted bounties
- Register /recover command in bot.py
- Add /recover to bot command list

/recover - list all recoverable bounties (sorted by deleted_at desc)
/recover <id...> - recover specific bounty(ies)

Output formats:
List: [#1] Deleted bounty | 🗑️ Deleted 2 Apr 2026
Recover: ✅ Recovered bounty #1. or ⛔ Bounty #5 not found or not deleted.

Fixes #49

apps/telegram-bot/bot.py

@@ -14,6 +14,7 @@ from commands import (
     cmd_edit,
     cmd_help,
     cmd_my,
+    cmd_recover,
     cmd_show,
     cmd_start,
     cmd_timezone,
@@ -47,6 +48,7 @@ def build_app() -> Application:
     app.add_handler(CommandHandler("show", cmd_show))
     app.add_handler(CommandHandler("timezone", cmd_timezone))
     app.add_handler(CommandHandler("admin", cmd_admin))
+    app.add_handler(CommandHandler("recover", cmd_recover))
 
     app.add_handler(MessageHandler(filters.COMMAND, cmd_help))
 
@@ -65,6 +67,7 @@ async def post_init(app: Application) -> None:
             ("show", "Show bounty details"),
             ("timezone", "Get/set room timezone"),
             ("admin", "Manage admins"),
+            ("recover", "Recover deleted bounties"),
             ("help", "Show help"),
         ]
     )