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/raulk/go-watchdog/watchdog_other.go

@@ -0,0 +1,13 @@
+// +build !linux
+
+package watchdog
+
+import (
+	"fmt"
+	"time"
+)
+
+// CgroupDriven is only available in Linux. This method will error.
+func CgroupDriven(frequency time.Duration, policyCtor PolicyCtor) (err error, stopFn func()) {
+	return fmt.Errorf("cgroups-driven watchdog: %w", ErrNotSupported), nil
+}