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/sashabaranov/go-openai/engines.go

@@ -0,0 +1,52 @@
+package openai
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+)
+
+// Engine struct represents engine from OpenAPI API.
+type Engine struct {
+	ID     string `json:"id"`
+	Object string `json:"object"`
+	Owner  string `json:"owner"`
+	Ready  bool   `json:"ready"`
+
+	httpHeader
+}
+
+// EnginesList is a list of engines.
+type EnginesList struct {
+	Engines []Engine `json:"data"`
+
+	httpHeader
+}
+
+// ListEngines Lists the currently available engines, and provides basic
+// information about each option such as the owner and availability.
+func (c *Client) ListEngines(ctx context.Context) (engines EnginesList, err error) {
+	req, err := c.newRequest(ctx, http.MethodGet, c.fullURL("/engines"))
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &engines)
+	return
+}
+
+// GetEngine Retrieves an engine instance, providing basic information about
+// the engine such as the owner and availability.
+func (c *Client) GetEngine(
+	ctx context.Context,
+	engineID string,
+) (engine Engine, err error) {
+	urlSuffix := fmt.Sprintf("/engines/%s", engineID)
+	req, err := c.newRequest(ctx, http.MethodGet, c.fullURL(urlSuffix))
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &engine)
+	return
+}