Integrate BACKBEAT SDK and resolve KACHING license validation

Major integrations and fixes:
- Added BACKBEAT SDK integration for P2P operation timing
- Implemented beat-aware status tracking for distributed operations
- Added Docker secrets support for secure license management
- Resolved KACHING license validation via HTTPS/TLS
- Updated docker-compose configuration for clean stack deployment
- Disabled rollback policies to prevent deployment failures
- Added license credential storage (CHORUS-DEV-MULTI-001)

Technical improvements:
- BACKBEAT P2P operation tracking with phase management
- Enhanced configuration system with file-based secrets
- Improved error handling for license validation
- Clean separation of KACHING and CHORUS deployment stacks

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

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

vendor/github.com/koron/go-ssdp/internal/multicast/udp.go

@@ -0,0 +1,65 @@
+package multicast
+
+import (
+	"net"
+	"sync"
+)
+
+type PacketHandler func(net.Addr, []byte) error
+
+type AddrResolver struct {
+	Addr string
+
+	mu  sync.RWMutex
+	udp *net.UDPAddr
+	err error
+}
+
+func (r *AddrResolver) setAddress(addr string) {
+	r.mu.Lock()
+	r.Addr = addr
+	r.udp = nil
+	r.err = nil
+	r.mu.Unlock()
+}
+
+func (r *AddrResolver) resolve() (*net.UDPAddr, error) {
+	r.mu.RLock()
+	if err := r.err; err != nil {
+		r.mu.RUnlock()
+		return nil, err
+	}
+	if udp := r.udp; udp != nil {
+		r.mu.RUnlock()
+		return udp, nil
+	}
+	r.mu.RUnlock()
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.udp, r.err = net.ResolveUDPAddr("udp4", r.Addr)
+	return r.udp, r.err
+}
+
+var RecvAddrResolver = &AddrResolver{Addr: "224.0.0.1:1900"}
+
+// SetRecvAddrIPv4 updates multicast address where to receive packets.
+// This never fail now.
+func SetRecvAddrIPv4(addr string) error {
+	RecvAddrResolver.setAddress(addr)
+	return nil
+}
+
+var sendAddrResolver = &AddrResolver{Addr: "239.255.255.250:1900"}
+
+// SendAddr returns an address to send multicast UDP package.
+func SendAddr() (*net.UDPAddr, error) {
+	return sendAddrResolver.resolve()
+}
+
+// SetSendAddrIPv4 updates a UDP address to send multicast packets.
+// This never fail now.
+func SetSendAddrIPv4(addr string) error {
+	sendAddrResolver.setAddress(addr)
+	return nil
+}