feat(FN-003): add tool manifest registry with FastAPI CRUD and built-in manifests

- Add ToolManifest Pydantic models with validators for ports, mounts, health checks, and traefik config

- Implement in-memory ToolRegistry with YAML loading and built-in manifest scanning

- Add FastAPI CRUD routes for listing, retrieving, and creating tool manifests

- Include built-in manifests for runfusion and code-server

- Harden web Dockerfile with unprivileged nginx and port 8080

- Add tool manifest specification documentation and architecture updates

Fusion-Task-Id: FN-003

package.json

@@ -12,6 +12,9 @@
     "compose:up": "docker compose up --build -d",
     "compose:down": "docker compose down"
   },
+  "pnpm": {
+    "onlyBuiltDependencies": ["esbuild"]
+  },
   "packageManager": "pnpm@11.1.1",
   "engines": {
     "node": ">=20",