ci: add workflow_dispatch to pages-build-site for manual ref deployment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: chaxus

.github/workflows/pages-build-site.yml

@@ -3,6 +3,12 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'Git ref to deploy (branch, tag, or SHA). Defaults to main.'
+        required: false
+        default: 'main'
 
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
@@ -22,6 +28,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.inputs.ref || github.ref }}
 
       - uses: pnpm/action-setup@v6
         name: Install pnpm