feat: add cleanup for unbound addresses feature (#739)

- Add unboundAddress cleanup type to backend cleanup logic
- Update CleanupSettings model with unbound address fields
- Add scheduled task for automatic unbound address cleanup
- Add UI controls in admin Maintenance panel for manual cleanup
- Add i18n support (en/zh) for unbound address cleanup labels
- Clean addresses not bound to any user created before n days

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

Co-authored-by: Claude <noreply@anthropic.com>

worker/src/scheduled.ts

@@ -50,4 +50,11 @@ export async function scheduled(event: ScheduledEvent, env: Bindings, ctx: any)
             autoCleanupSetting.cleanAddressDays
         );
     }
+    if (autoCleanupSetting.enableUnboundAddressAutoCleanup) {
+        await cleanup(
+            { env: env, } as Context<HonoCustomType>,
+            "unboundAddress",
+            autoCleanupSetting.cleanUnboundAddressDays
+        );
+    }
 }