Move pnpm onlyBuiltDependencies into pnpm-workspace.yaml

pnpm 10.x no longer reads the "pnpm" key in package.json and now hard-fails
the install with ERR_PNPM_IGNORED_BUILDS when build scripts are ignored.
Migrate the existing allowlist to pnpm-workspace.yaml and add msw (pulled
in transitively by vitest 4.x).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -16,15 +16,6 @@
     "format": "prettier --write \"**/*.{ts,tsx,js,jsx,json,css,md}\"",
     "format:check": "prettier --check \"**/*.{ts,tsx,js,jsx,json,css,md}\""
   },
-  "pnpm": {
-    "onlyBuiltDependencies": [
-      "@nestjs/core",
-      "@prisma/client",
-      "@prisma/engines",
-      "prisma",
-      "unrs-resolver"
-    ]
-  },
   "devDependencies": {
     "prettier": "3.8.2"
   }

pnpm-workspace.yaml

@@ -1,3 +1,11 @@
 packages:
   - "tehriehlbudget-frontend"
   - "tehriehlbudget-backend"
+
+onlyBuiltDependencies:
+  - "@nestjs/core"
+  - "@prisma/client"
+  - "@prisma/engines"
+  - "msw"
+  - "prisma"
+  - "unrs-resolver"