refactor: restructure bastion as pnpm monorepo (@lab/shared, @lab/bastion, @lab/cli)

- Split into 3 workspace packages: shared (types/constants), bastion (server), cli
- CLI binary renamed from "bastion" to "lab"
- Cross-package imports via @lab/shared and @lab/bastion workspace references
- Extracted BastionConfig, BastionState, HardwareInfo types into @lab/shared
- Added APP_NAME/APP_VERSION constants
- tsconfig.base.json with project references for build ordering
- Root workspace scripts: build, test, typecheck, clean

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bastion/package.json

@@ -1,34 +1,22 @@
 {
-  "name": "lab-bastion",
+  "name": "lab",
   "version": "0.1.0",
   "private": true,
   "description": "PXE bastion server for discover-first bare-metal provisioning",
   "type": "module",
-  "bin": {
-    "bastion": "./dist/cli/index.js"
-  },
-  "main": "./dist/server/main.js",
   "scripts": {
-    "build": "tsc",
-    "dev": "tsx src/cli/index.ts",
-    "start": "node dist/cli/index.js",
+    "build": "pnpm -r run build",
     "test": "vitest",
     "test:run": "vitest run",
-    "lint": "tsc --noEmit",
-    "clean": "rimraf dist"
+    "typecheck": "tsc --build",
+    "clean": "pnpm -r run clean && rimraf node_modules",
+    "lint": "eslint 'src/*/src/**/*.ts'"
   },
   "engines": {
     "node": ">=20.0.0",
     "pnpm": ">=9.0.0"
   },
   "packageManager": "pnpm@9.15.0",
-  "dependencies": {
-    "@fastify/static": "^8.0.0",
-    "commander": "^13.0.0",
-    "execa": "^9.5.0",
-    "fastify": "^5.0.0",
-    "winston": "^3.17.0"
-  },
   "devDependencies": {
     "@types/node": "^22.10.0",
     "rimraf": "^6.0.0",