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

cmd/asinfo-gen/main.go

@@ -24,14 +24,16 @@ type ASInfo struct {
 func main() {
 	// Configure logger to write to stderr
 	log.SetOutput(os.Stderr)
-	
+
 	// Fetch the CSV data
 	log.Println("Fetching AS CSV data...")
 	resp, err := http.Get(asCsvURL)
 	if err != nil {
 		log.Fatalf("Failed to fetch CSV: %v", err)
 	}
-	defer resp.Body.Close()
+	defer func() {
+		_ = resp.Body.Close()
+	}()
 
 	if resp.StatusCode != http.StatusOK {
 		log.Fatalf("Failed to fetch CSV: HTTP %d", resp.StatusCode)
@@ -39,13 +41,13 @@ func main() {
 
 	// Parse CSV
 	reader := csv.NewReader(resp.Body)
-	
+
 	// Read header
 	header, err := reader.Read()
 	if err != nil {
 		log.Fatalf("Failed to read CSV header: %v", err)
 	}
-	
+
 	if len(header) != 3 || header[0] != "asn" || header[1] != "handle" || header[2] != "description" {
 		log.Fatalf("Unexpected CSV header: %v", header)
 	}
@@ -59,17 +61,21 @@ func main() {
 		}
 		if err != nil {
 			log.Printf("Error reading CSV record: %v", err)
+
 			continue
 		}
 
-		if len(record) != 3 {
+		const expectedFields = 3
+		if len(record) != expectedFields {
 			log.Printf("Skipping invalid record: %v", record)
+
 			continue
 		}
 
 		asn, err := strconv.Atoi(record[0])
 		if err != nil {
 			log.Printf("Invalid ASN %q: %v", record[0], err)
+
 			continue
 		}
 
@@ -88,4 +94,4 @@ func main() {
 	if err := encoder.Encode(asInfos); err != nil {
 		log.Fatalf("Failed to encode JSON: %v", err)
 	}
-}
+}