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/stream.go

@@ -0,0 +1,55 @@
+package openai
+
+import (
+	"context"
+	"errors"
+	"net/http"
+)
+
+var (
+	ErrTooManyEmptyStreamMessages = errors.New("stream has sent too many empty messages")
+)
+
+type CompletionStream struct {
+	*streamReader[CompletionResponse]
+}
+
+// CreateCompletionStream — API call to create a completion w/ streaming
+// support. It sets whether to stream back partial progress. If set, tokens will be
+// sent as data-only server-sent events as they become available, with the
+// stream terminated by a data: [DONE] message.
+func (c *Client) CreateCompletionStream(
+	ctx context.Context,
+	request CompletionRequest,
+) (stream *CompletionStream, err error) {
+	urlSuffix := "/completions"
+	if !checkEndpointSupportsModel(urlSuffix, request.Model) {
+		err = ErrCompletionUnsupportedModel
+		return
+	}
+
+	if !checkPromptType(request.Prompt) {
+		err = ErrCompletionRequestPromptTypeNotSupported
+		return
+	}
+
+	request.Stream = true
+	req, err := c.newRequest(
+		ctx,
+		http.MethodPost,
+		c.fullURL(urlSuffix, withModel(request.Model)),
+		withBody(request),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := sendRequestStream[CompletionResponse](c, req)
+	if err != nil {
+		return
+	}
+	stream = &CompletionStream{
+		streamReader: resp,
+	}
+	return
+}