Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/observability/tracing.go

@@ -0,0 +1,48 @@
+package observability
+
+import (
+	"context"
+	"fmt"
+)
+
+// Tracer provides distributed tracing
+type Tracer interface {
+	StartSpan(ctx context.Context, name string) (context.Context, Span)
+}
+
+// Span represents a tracing span
+type Span interface {
+	End()
+	SetAttribute(key string, value interface{})
+	SetError(err error)
+}
+
+// MockTracer is a mock tracer for development
+type MockTracer struct{}
+
+// StartSpan starts a new span
+func (t *MockTracer) StartSpan(ctx context.Context, name string) (context.Context, Span) {
+	return ctx, &MockSpan{}
+}
+
+// MockSpan is a mock span
+type MockSpan struct{}
+
+// End ends the span
+func (m *MockSpan) End() {}
+
+// SetAttribute sets an attribute
+func (m *MockSpan) SetAttribute(key string, value interface{}) {}
+
+// SetError sets an error
+func (m *MockSpan) SetError(err error) {}
+
+// TraceConversation traces a conversation turn
+func TraceConversation(ctx context.Context, tracer Tracer, sessionID, userID string, input string) (context.Context, Span) {
+	ctx, span := tracer.StartSpan(ctx, "conversation.turn")
+	span.SetAttribute("session_id", sessionID)
+	span.SetAttribute("user_id", userID)
+	span.SetAttribute("input_length", len(input))
+	return ctx, span
+}
+