Initial implementation of SkyView - ADS-B aircraft tracker

- Go application with embedded static files for dump1090 frontend
- TCP client for SBS-1/BaseStation format (port 30003)
- Real-time WebSocket updates with aircraft tracking
- Modern web frontend with Leaflet maps and mobile-responsive design
- Aircraft table with filtering/sorting and statistics dashboard
- Origin configuration for receiver location and distance calculations
- Automatic config.json loading from current directory
- Foreground execution by default with optional -daemon flag

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

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

internal/parser/sbs1.go

@@ -0,0 +1,95 @@
+package parser
+
+import (
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Aircraft struct {
+	Hex         string    `json:"hex"`
+	Flight      string    `json:"flight,omitempty"`
+	Altitude    int       `json:"alt_baro,omitempty"`
+	GroundSpeed int       `json:"gs,omitempty"`
+	Track       int       `json:"track,omitempty"`
+	Latitude    float64   `json:"lat,omitempty"`
+	Longitude   float64   `json:"lon,omitempty"`
+	VertRate    int       `json:"vert_rate,omitempty"`
+	Squawk      string    `json:"squawk,omitempty"`
+	Emergency   bool      `json:"emergency,omitempty"`
+	OnGround    bool      `json:"on_ground,omitempty"`
+	LastSeen    time.Time `json:"last_seen"`
+	Messages    int       `json:"messages"`
+}
+
+type AircraftData struct {
+	Now      int64               `json:"now"`
+	Messages int                 `json:"messages"`
+	Aircraft map[string]Aircraft `json:"aircraft"`
+}
+
+func ParseSBS1Line(line string) (*Aircraft, error) {
+	parts := strings.Split(strings.TrimSpace(line), ",")
+	if len(parts) < 22 {
+		return nil, nil
+	}
+
+	messageType := parts[1]
+	if messageType != "1" && messageType != "3" && messageType != "4" {
+		return nil, nil
+	}
+
+	aircraft := &Aircraft{
+		Hex:      strings.TrimSpace(parts[4]),
+		LastSeen: time.Now(),
+		Messages: 1,
+	}
+
+	if parts[10] != "" {
+		aircraft.Flight = strings.TrimSpace(parts[10])
+	}
+
+	if parts[11] != "" {
+		if alt, err := strconv.Atoi(parts[11]); err == nil {
+			aircraft.Altitude = alt
+		}
+	}
+
+	if parts[12] != "" {
+		if gs, err := strconv.Atoi(parts[12]); err == nil {
+			aircraft.GroundSpeed = gs
+		}
+	}
+
+	if parts[13] != "" {
+		if track, err := strconv.Atoi(parts[13]); err == nil {
+			aircraft.Track = track
+		}
+	}
+
+	if parts[14] != "" && parts[15] != "" {
+		if lat, err := strconv.ParseFloat(parts[14], 64); err == nil {
+			aircraft.Latitude = lat
+		}
+		if lon, err := strconv.ParseFloat(parts[15], 64); err == nil {
+			aircraft.Longitude = lon
+		}
+	}
+
+	if parts[16] != "" {
+		if vr, err := strconv.Atoi(parts[16]); err == nil {
+			aircraft.VertRate = vr
+		}
+	}
+
+	if parts[17] != "" {
+		aircraft.Squawk = strings.TrimSpace(parts[17])
+	}
+
+	if parts[21] != "" {
+		aircraft.OnGround = parts[21] == "1"
+	}
+
+	return aircraft, nil
+}
+