Add documentation deployment workflow and update feature installation instructions

.github/workflows/docs.yml

@@ -0,0 +1,56 @@
+name: 构建并部署文档
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - docs/**
+      - mkdocs.yml
+      - pyproject.toml
+      - uv.lock
+      - .github/workflows/docs.yml
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 检出代码
+        uses: actions/checkout@v6
+
+      - name: 配置 uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: 构建文档
+        run: uv run --frozen mkdocs build --strict --site-dir site
+
+      - name: 整理发布目录
+        run: |
+          mkdir -p public/snapform
+          cp -a site/. public/snapform/
+
+      - name: 配置 Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "24"
+
+      - name: 部署到 Cloudflare Workers
+        env:
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_WORKER_NAME: ${{ vars.CLOUDFLARE_WORKER_NAME }}
+        run: |
+          test -n "$CLOUDFLARE_ACCOUNT_ID"
+          test -n "$CLOUDFLARE_API_TOKEN"
+          test -n "$CLOUDFLARE_WORKER_NAME"
+          npx --yes wrangler@4 deploy \
+            --assets ./public \
+            --name "$CLOUDFLARE_WORKER_NAME" \
+            --compatibility-date 2026-08-19 \
+            --keep-vars \
+            --message "SnapForm docs $GITHUB_SHA" \
+            --autoconfig=false