feat(ui): add message cache management page and dashboard enhancements

- Introduced MessageCachePage for browsing and managing cached webhook events.
- Enhanced DashboardPage to display runtime stats and message cache information.
- Added new API types for message cache events and system stats.
- Integrated SwaggerPage for API documentation and live request testing.

WHATSAPP_BUSINESS.md

@@ -554,6 +554,7 @@ Add to your `config.json`:
 {
   "message_cache": {
     "enabled": true,
+    "storage": "database",
     "data_path": "./data/message_cache",
     "max_age_days": 7,
     "max_events": 10000
@@ -832,6 +833,7 @@ Here's a complete `config.json` with all Business API features:
   },
   "message_cache": {
     "enabled": true,
+    "storage": "database",
     "data_path": "./data/message_cache",
     "max_age_days": 7,
     "max_events": 10000