feat(site): product landing page for GitHub Pages (GTM §7)

.github/workflows/pages.yml

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+name: Deploy site (GitHub Pages)
+
+# Publishes the product landing page in site/ to GitHub Pages (GTM §7
+# "真正的产品站"). Manual on purpose: going live changes the public homepage,
+# which is the owner's call, and it also avoids a red run on main before Pages
+# is enabled.
+#
+# ONE-TIME owner setup before the first run:
+#   1. Repo → Settings → Pages → Build and deployment → Source: "GitHub Actions".
+#   2. Run this workflow (Actions tab → "Deploy site" → Run workflow).
+#   3. Point package.json `homepageUrl` / the repo "Website" at the Pages URL.
+# After that, switching to auto-deploy is one line — add a `push:` trigger
+# scoped to `paths: [site/**]`.
+
+on:
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# One concurrent deploy; don't cancel an in-progress publish.
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: actions/configure-pages@v5
+
+      - name: Upload site/ artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

site/README.md

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+# site/ — Markup product landing page
+
+The product site for GTM-SCALE-PLAN.md §7 ("真正的产品站"): a single
+self-contained `index.html` (inline CSS, no build step) plus `assets/`.
+
+Replaces the weak status quo where `homepageUrl` points at the releases page —
+this is a real landing surface (hero, download matrix, feature grid, honest
+comparison table, the GitHub-docs-reader wedge) tuned for conversion + SEO.
+
+## Honesty rules (keep these true)
+
+- **Platform truth:** macOS available; iOS/iPadOS "in review"; Windows/Linux
+  "coming soon" (CI-validated, not released). Update the day the beta ships.
+- **Respectful comparison** (GTM §9): the table names where Typora/Obsidian are
+  stronger. Don't turn it into a hit piece.
+- **No invented numbers / no fake social proof.**
+
+## Preview locally
+
+```bash
+python3 -m http.server 8765 --directory site
+# open http://localhost:8765
+```
+
+## Publish (owner, one-time)
+
+GitHub Pages serves this via [`.github/workflows/pages.yml`](../.github/workflows/pages.yml):
+
+1. Repo → **Settings → Pages → Source: "GitHub Actions"**.
+2. **Actions → "Deploy site" → Run workflow.**
+3. Point `package.json` `homepageUrl` (and the repo "Website" field) at the
+   Pages URL.
+
+Going live is intentionally manual — publishing the public homepage is the
+owner's call. After the first deploy, add a `push:` trigger scoped to
+`paths: [site/**]` to auto-deploy on content changes.
+
+## Assets
+
+`hero.gif`, `screenshot-*.png`, `social-card.png`, `128x128@2x.png` are copied
+from `docs/assets/` and `src-tauri/icons/`. If those originals change, refresh
+the copies here.