api-gateway: migrate YAML gen + provider core from deck-api (?endpoint=) to lk-api-gateway (REST paths)

- service_spec_gen: callAPI() auto-detects proxy vs REST mode by index.cfm presence
- core/client.go: buildURL() replaces all 4 ?endpoint= harcoded sites
- build-provider.sh: -ldflags -X main.version=${VERSION} for correct binary version
- 01_generate_yamls.sh (devops + root): Python auto-detect proxy vs REST
- 02_generate_resources_and_docs_v2.sh: pass -api-endpoint to doc generators
- 04_build_and_publish_docs.sh: normalize_api_endpoint without forced /index.cfm
- docs_template_gen + v2: -api-endpoint flag, hardcoded deck-api replaced
- provider.go (both): TODO(api-gateway) comments
- profiles/test/profile.env: NUBES_API_ENDPOINT -> lk-api-gateway-test
- HISTORY: 2026-07-02_api_gateway_migration.md

internal/provider/provider.go

@@ -100,6 +100,8 @@ func (p *NubesProvider) Configure(ctx context.Context, req provider.ConfigureReq
 	}
 
 	// Default values
+	// TODO(api-gateway): default is legacy proxy (index.cfm?endpoint=).
+	// core.UniversalClient still uses ?endpoint= pattern — needs migration to REST paths.
 	apiEndpoint := "https://deck-api.ngcloud.ru/api/v1/index.cfm"
 	apiToken := ""