feat(swagger): support dynamic host via EZ_SWAGGER_HOST env var

- Add ServerConfig.SwaggerHost field
- Set docs.SwaggerInfo.Host dynamically at startup
- Update docker-compose, k8s manifests, and .env.example

docker-compose.yml

@@ -79,6 +79,7 @@ services:
       EZ_LOG_RETENTION_DAYS: ${EZ_LOG_RETENTION_DAYS:-30}
       EZ_LOG_MAX_RECORDS: ${EZ_LOG_MAX_RECORDS:-1000000}
       EZ_LOG_PARTITIONING: ${EZ_LOG_PARTITIONING:-off}
+      EZ_SWAGGER_HOST: ${EZ_SWAGGER_HOST:-}
     depends_on:
       postgres:
         condition: service_healthy