feat: Migrate landing page to Vue 3 + TypeScript

- Replace static HTML with Vue 3 SPA (Vite + TypeScript)
- Add GalaxyCanvas component (interactive particle animation)
- Component-based sections (HeroSection, SectionBlock, FooterView)
- Add nginx.conf with SPA routing + security headers
- Update compose.yaml to mount nginx config
- Build output in html/ directory

vite.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  build: {
+    outDir: 'html',
+    emptyOutDir: true,
+  },
+})