Remove BGP keepalive logging and add peer tracking

- Created bgp_peers table to track all BGP peers
- Added PeerHandler to update peer last seen times for all message types
- Removed verbose BGP keepalive debug logging
- BGP keepalive messages now silently update peer tracking

Refactor HTML templates to use go:embed

- Created internal/templates package with embedded templates
- Moved status.html from inline const to separate file
- Templates are parsed once on startup
- Server now uses parsed template instead of raw string

Optimize AS data embedding with gzip compression

- Changed asinfo package to embed gzipped data (2.4MB vs 12MB)
- Updated Makefile to gzip AS data during update
- Added decompression during initialization
- Raw JSON file excluded from git

internal/routewatch/app.go

@@ -76,6 +76,10 @@ func (rw *RouteWatch) Run(ctx context.Context) error {
 	dbHandler := NewDatabaseHandler(rw.db, rw.logger)
 	rw.streamer.RegisterHandler(dbHandler)
 
+	// Register peer tracking handler to track all peers
+	peerHandler := NewPeerHandler(rw.db, rw.logger)
+	rw.streamer.RegisterHandler(peerHandler)
+
 	// Start streaming
 	if err := rw.streamer.Start(); err != nil {
 		return err