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/787878/twistie-down.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#787878" d="M2.611 5.393c-.17-.216-.084-.393.191-.393h10.397c.275 0 .361.177.191.393l-5.08 6.464c-.17.216-.452.216-.622 0l-5.077-6.464z"/></svg>

public/core/misc/icons/787878/twistie-up.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#787878" d="M13.391 10.607c.17.216.084.393-.191.393h-10.398c-.275 0-.361-.177-.191-.393l5.08-6.464c.17-.216.45-.216.62 0l5.08 6.464z"/></svg>