feat: Enhance web interface with database integration and callsign management

- Add callsign management module for enhanced aircraft information
- Integrate database status display in web interface
- Update aircraft manager with database-backed callsign resolution
- Enhance user interface with database connectivity indicators
- Add embedded asset management for new database interface components

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

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

assets/assets.go

@@ -28,5 +28,6 @@ import "embed"
 // This approach ensures the web interface is always available without requiring
 // external file deployment or complicated asset management.
 //
+// Updated to include database.html for database status page
 //go:embed static
 var Static embed.FS