fix(consul): Fix health checks for gRPC services in Docker

- Add gRPC health check support to Consul registry
  - Services are gRPC-only, not HTTP
  - Consul was trying HTTP health checks which failed
  - Now uses gRPC health checks via grpc.health.v1.Health service

- Update HealthCheckConfig to support both HTTP and gRPC
  - Add GRPC field for gRPC service name
  - Add UseGRPC flag to choose health check type
  - Default to gRPC for services (use_grpc: true in config)

- Fix service address registration in Docker
  - Services now register with Docker service name (e.g., auth-service)
  - Allows Consul to reach services via Docker network DNS
  - Falls back to localhost for local development

- Update default.yaml to enable gRPC health checks
  - Set use_grpc: true
  - Set grpc: grpc.health.v1.Health

This fixes services being deregistered from Consul due to failed
HTTP health checks. Services will now pass gRPC health checks.

cmd/authz-service/main.go

@@ -183,7 +183,13 @@ func registerLifecycle(
 			serviceID := fmt.Sprintf("authz-service-%d", time.Now().Unix())
 			host := cfg.GetString("services.authz.host")
 			if host == "" {
-				host = "localhost"
+				// In Docker, use service name for Consul to reach the service
+				// For local development, use localhost
+				if os.Getenv("ENVIRONMENT") == "production" || os.Getenv("DOCKER") == "true" {
+					host = "authz-service" // Docker service name
+				} else {
+					host = "localhost"
+				}
 			}
 			port := grpcServer.Port()