fix(ci): use pnpm 11 allowBuilds syntax and pin pnpm version

The previous fix (#119) used `onlyBuiltDependencies` in pnpm-workspace.yaml,
but the CI runner resolved `version: latest` to pnpm 11.1.2, where that key
was removed and replaced by `allowBuilds` (a map of name -> bool). The
`pnpm.onlyBuiltDependencies` block in package.json doesn't apply at the
workspace level either, so esbuild was still being ignored.

Changes:
- pnpm-workspace.yaml: replace `onlyBuiltDependencies: [esbuild]` with
  `allowBuilds: { esbuild: true }` (pnpm 11 syntax).
- package.json: add `packageManager: pnpm@11.1.2` so the version is
  reproducible across CI and local; drop the now-dead `pnpm` block.
- .github/workflows/build.yml: drop `version: latest` from
  pnpm/action-setup; the action reads the version from `packageManager`.

.github/workflows/build.yml

@@ -13,8 +13,7 @@ jobs:
 
    - name: Install pnpm 📥
      uses: pnpm/action-setup@v4
-     with:
+     # Version is read from `packageManager` in package.json for reproducible builds.
-      version: latest
 
    - name: Install Node.js 📥
      uses: actions/setup-node@v4

package.json

@@ -2,6 +2,7 @@
 	"name": "@meowarex/TidalLuna-Plugins",
 	"description": "A Collection of Plugins for TidalLuna",
 	"type": "module",
+	"packageManager": "pnpm@11.1.2",
 	"scripts": {
 		"watch": "concurrently \"pnpm:build --watch\" pnpm:serve",
 		"build": "rimraf ./dist && tsx esbuild.config.ts",
@@ -18,10 +19,5 @@
 		"rimraf": "^6.0.1",
 		"tsx": "^4.19.4",
 		"typescript": "^5.8.3"
-	},
-	"pnpm": {
-		"onlyBuiltDependencies": [
-			"esbuild"
-		]
 	}
 }

pnpm-workspace.yaml

@@ -1,5 +1,7 @@
 packages:
  - "plugins/*"
 
-onlyBuiltDependencies:
+# pnpm 11 renamed `onlyBuiltDependencies` (list) to `allowBuilds` (map of name -> bool).
- - esbuild
+# This whitelists postinstall/build scripts non-interactively in CI.
+allowBuilds:
+ esbuild: true