chore: deploy to Cloudflare Pages and update branding

- Add Cloudflare Pages deployment for landing page (snapotter.com) and
  docs (docs.snapotter.com)
- Create deploy-landing.yml and update deploy-docs.yml workflows
- Update CI to ignore apps/landing/** paths
- Fix logo transparency (remove white background) across all apps
- Recreate social-preview.png with SnapOtter branding
- Update all docs URLs from GitHub Pages to docs.snapotter.com
- Update VitePress config: light theme default, fix llms.txt paths
- Add .vitepress/cache/ and .env.* to gitignore

apps/web/vite.config.ts

@@ -12,7 +12,8 @@ export default defineConfig({
     dedupe: ["react", "react-dom"],
   },
   server: {
-    port: Number(process.env.PORT) || 1349,
+    host: true,
+    port: Number(process.env.PORT) || 1351,
     proxy: {
       "/api": process.env.VITE_API_URL || "http://localhost:13490",
     },