feat(events): add message update, role, and voice state update handlers

- Implemented `handle_message_update` to log message edits.
- Created role event handlers for role creation, update, and deletion.
- Added voice state update handling to log channel changes.
- Introduced a new `ready_event` handler to restore bot presence and enforce blacklist.
- Updated `mod.rs` to include new event modules.
- Enhanced `main.rs` for database connection and initialization.
- Added comprehensive permission management in `permissions.rs`.

.env.example

@@ -0,0 +1,11 @@
+# Discord
+BOT_TOKEN=change_me
+FORCE_OWNER_IDS=671763971803447298
+
+# PostgreSQL
+POSTGRES_DB=shadowbot
+POSTGRES_USER=shadowbot
+POSTGRES_PASSWORD=change_me
+
+# App database URL
+DATABASE_URL=postgres://shadowbot:change_me@postgres:5432/shadowbot