refactor: extract all generators into independent TOOLS/ modules

Each generator is now a standalone Go module with its own go.mod:

TOOLS/
├── yaml-generator/       ← service_spec_gen (API → YAML)
├── resource-generator/   ← gen_v2 (YAML → Go resources)
├── docs-generator/       ← docs_template_gen_v2 (YAML → Markdown)
├── ops-generator/        ← ops_docs_gen (ops documentation)
└── bin/                  ← pre-built binaries

All scripts updated to use TOOLS/bin/* binaries.
Removed old universal_rebuild/tools/ and universal_rebuild/bin/.

devops/02_generate_resources_and_docs_v2.sh

@@ -81,7 +81,7 @@ trap 'rm -rf "$TMP_GEN_DIR"' EXIT
 
 NUBES_RESOURCES_DIR="$RESOURCES_YAML_DIR" \
 NUBES_RESOURCES_GEN_DIR="$TMP_GEN_DIR" \
-go run ./tools/gen_v2
+${ROOT_DIR}/TOOLS/bin/resource-generator
 
 mkdir -p "$GO_OUTPUT_DIR"
 rm -rf "${GO_OUTPUT_DIR}"/*
@@ -99,7 +99,7 @@ if [[ "$DOCS_API_ENDPOINT" != *"/index.cfm"* ]] && [[ "$DOCS_API_ENDPOINT" != *"
   DOCS_API_ENDPOINT="${DOCS_API_ENDPOINT%/}/index.cfm"
 fi
 
-go run ./tools/docs_template_gen_v2 \
+${ROOT_DIR}/TOOLS/bin/docs-generator \
   -resources "$RESOURCES_YAML_DIR" \
   -docs "$DOCS_DIR" \
   -services "$SERVICES_LIST_PATH" \