feat: add Temporal config and update routing with memory service integration

- Add TemporalConfig struct to internal/config
- Update gateway config with Temporal frontend service (port 7233)
- Update router with memory service adapter support
- Add config.local.yaml with memory service configuration
- Encrypt production config with SOPS (AES256_GCM)
- Support X-Service header routing pattern for service discovery
- Keep legacy path-based routes with deprecation warnings
- All 5 adapters preserved: workflow, memory, sqs, s3, iam

internal/serviceadapter/router.go

@@ -164,6 +164,10 @@ func (d *Dispatcher) dispatchHTTP(w http.ResponseWriter, r *http.Request, upstre
 		req.URL.Path = method.UpstreamPath
 		req.RequestURI = ""
 		req.Host = parsedURL.Host
+		
+		// Preserve Authorization header for S3 SigV4 and other auth schemes
+		// Note: httputil.ReverseProxy preserves most headers automatically,
+		// but we need to ensure Authorization isn't lost when overriding Director
 	}
 
 	timeout := adapter.Spec.Upstream.TimeoutSeconds