Modernize role management system with slash commands and role IDs

- Convert role management from prefix to slash commands (/role add/remove/list)
- Update database schema to store role IDs as JSON arrays instead of regex patterns
- Add /config roles command for administrators to manage allowed roles
- Simplify database schema by reusing allowed_roles_for_request field as JSON
- Add database reset script (pnpm reset-db) for easy testing and migration
- Update config format to only support array format (no backward compatibility)

Role Management Features:
- /role add <role> - Self-assign roles with dropdown selection
- /role remove <role> - Remove roles with dropdown selection
- /role list - Show available self-assignable roles
- /config roles add/remove/list/clear - Administrator role management

Technical Improvements:
- Role ID based matching (more reliable than name-based regex)
- Type-safe role selection with Discord's native role picker
- Permission hierarchy validation
- Rich embed responses with proper error handling
- Ephemeral responses for clean chat experience

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -32,6 +32,7 @@
     "restart": "docker compose restart",
     "logs": "docker compose logs -f",
     "boom": "pnpm stop && pnpm build && pnpm start",
+    "reset-db": "pnpm stop && rm -f data/ghbot.db data/ghbot.db-shm data/ghbot.db-wal && echo 'Database reset complete. Run pnpm start to re-seed from config.json'",
     "image:build": "docker build -t ghbot:${VERSION:-latest} .",
     "image:run": "docker run -d --name ghbot --restart always ghbot:${VERSION:-latest}"
   },