feat(site): Astro intro homepage + static OpenAPI docs + GitHub Pages deploy

Astro site (homepage + Scalar API reference from a static openapi.json) deployed
to GitHub Pages alongside the static JSON dump, so the dataset is served as a
static API even while it is still partial.

Author: Seungpyo1007

.github/workflows/deploy-pages.yml

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+name: deploy-pages
+
+# Builds the Astro site (intro homepage + OpenAPI docs) together with the static
+# JSON data dump and deploys everything to GitHub Pages. The dataset does not need
+# to be complete — whatever is curated in data/ is published.
+# Enable once: Settings → Pages → Source = GitHub Actions.
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - name: Install Python deps
+        run: pip install -e .
+
+      - name: Validate curated data
+        run: python -m scripts.validate
+
+      - name: Generate static JSON dump + openapi.json
+        run: python -m scripts.dump --output dump
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: site/package-lock.json
+
+      - name: Build Astro site
+        run: |
+          cd site
+          npm ci
+          npm run build
+
+      - name: Assemble site (Astro dist + JSON data dump)
+        run: |
+          mkdir -p _site
+          cp -r site/dist/. _site/
+          cp -r dump/. _site/
+          touch _site/.nojekyll
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: _site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

site/.gitignore

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+# Astro / Node build artifacts
+node_modules/
+dist/
+.astro/

site/astro.config.mjs

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+import { defineConfig } from 'astro/config';
+
+// GitHub Pages project site. Data dump (v1/, openapi.json) is copied alongside
+// the built site in CI, so internal links use import.meta.env.BASE_URL.
+export default defineConfig({
+  site: 'https://seungpyo1007.github.io',
+  base: '/TechAPI',
+});