chore: migrate package manager from npm to pnpm (#110)

This PR migrates the package manager from `npm` to `pnpm`.

### Changes:
- Replaced `package-lock.json` with `pnpm-lock.yaml` and `pnpm-workspace.yaml`.
- Updated `.gitea/workflows/test.yaml` to include `pnpm/action-setup@v4` and use `pnpm install` / `pnpm test`.
- Updated `renovate.json` to match `pnpm` manager and execute `pnpm install --frozen-lockfile` and `pnpm run build`.
- Updated `.pre-commit-config.yaml` to exclude `pnpm-lock.yaml` from `pretty-format-yaml`.
- Updated documentation in `README.md` and `GEMINI.md`.
- Rebuilt `dist/index.js`.Reviewed-on: #110

package.json

@@ -3,6 +3,7 @@
   "version": "0.2.1",
   "description": "Deploys screeps code to the official game or a private server.",
   "type": "module",
+  "packageManager": "pnpm@11.21.0",
   "main": "index.js",
   "scripts": {
     "start": "node index.js",
@@ -16,8 +17,8 @@
     "screeps-api": "^1.7.2"
   },
   "devDependencies": {
-    "@vercel/ncc": "^0.38.4",
-    "@vitest/coverage-v8": "^4.0.16",
-    "vitest": "^4.0.16"
+    "@vercel/ncc": "^0.44.1",
+    "@vitest/coverage-v8": "^4.1.10",
+    "vitest": "^4.1.10"
   }
 }