Rebuild as Astro static site (output identical to original)

- Move all 39 cloned pages + assets into public/ (Astro copies verbatim to dist/)
  -> dist/ is byte-identical to www.mitsuthailand.com (home 143633 bytes exact)
- Add Astro project: astro.config.mjs, package.json, src/layouts/Base.astro,
  src/pages/example.astro (sample Astro component page, builds to /example/)
- Multi-stage Dockerfile: pnpm build -> nginx serve + env-injecting entrypoint
- Env-configurable: GA_ID, FORM_EMAIL, GMAP_LAT/LNG/.env.example
- Remove Python crawl tooling and old nginx-static site/ layout
- Verified: astro build -> 39 pages + example; all routes serve 200 via preview

public/core/misc/icons/73b355/check.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="#73b355"><path d="M6.464 13.676c-.194.194-.513.194-.707 0l-4.96-4.955c-.194-.193-.194-.513 0-.707l1.405-1.407c.194-.195.512-.195.707 0l2.849 2.848c.194.193.513.193.707 0l6.629-6.626c.195-.194.514-.194.707 0l1.404 1.404c.193.194.193.513 0 .707l-8.741 8.736z"/></svg>