feat: prerender every route + Gitea Actions deploy

Make the site fully prerendered so a plain curl returns complete content
for every route (crawlers / AI screening tools see real text, not an empty
#root), while humans keep full client interactivity.

Prerender:
- Build-time per-route render: prefetch data, renderToString, inline the
  dehydrated react-query cache as window.__RQ_STATE__; client hydrateRoots
  and refetches live (activity stays fresh; crawlers get the baked snapshot).
- New entry-server.tsx + prerender/{prefetch,routes,meta}.ts + run-prerender.mjs;
  shared lib/ranges.ts keeps SSR and client query keys identical.
- pnpm build now: tsc -b -> vite client build -> ssr build -> prerender.
- API base absolute at build (VITE_API_BASE), relative /api/v1 in the browser.
- CSS imports moved to the client entry so the tree imports under Node.
- schema.org Person + Occupation JSON-LD and per-route title/description/og.
- UTC + explicit field widths on shared date formatting so SSR and client
  hydration match byte-for-byte (fixes hydration mismatch on /activity).
- Strip non-text gist content from the CV fetch (1MB -> 25KB gzipped page).

Deploy (Gitea Actions, replaces script/deploy.sh):
- deploy.yml: on push to main, lint/test gate, build api+worker as static
  musl binaries (pure-rustls, no glibc skew) + prerendered web, deploy each
  over SSH as gitea_ci with scoped sudo.
- refresh.yml: daily cron re-bakes only the web snapshot so gist/activity
  edits propagate without a push or bouncing the api/worker.
- script/infra-setup.sh + asset/sudoers.d/{api,worker,web}-host.conf for
  one-time per-host provisioning. Secrets: RSYNC_SSH_KEY, QUERY_GITHUB_TOKEN,
  QUERY_GITEA_TOKEN.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X7zF7Kf4JqDwa6M8Qgge9M

ui/vite.config.ts

@@ -7,6 +7,14 @@ import react from '@vitejs/plugin-react-swc';
 // frontend's URL shape is identical in both environments.
 export default defineConfig({
   plugins: [react()],
+  // For the prerender (`vite build --ssr`), bundle dependencies into the server
+  // output rather than externalising them. Several deps (react-bootstrap,
+  // react-markdown, …) use subpath/ESM-directory imports or pull in CSS that a
+  // raw Node `import` of the externalised package can't resolve; bundling lets
+  // vite resolve the subpaths and strip the CSS. Has no effect on client builds.
+  ssr: {
+    noExternal: true,
+  },
   server: {
     proxy: {
       '/api': {