feat(web): support classic Rsbuild dev and build

- migrate the classic frontend from Vite to Rsbuild with JSX, Semi UI, proxy, and production build config.
- update make dev-web to run both default and classic frontends for local theme switching.
- fix classic public page height, footer, CORS proxy, error handling, and constant export warnings.
- update Dockerfile and release workflow to install from the web workspace root with the shared lockfile.

web/default/rsbuild.config.ts

@@ -65,6 +65,7 @@ export default defineConfig(({ envMode }) => {
     },
     server: {
       host: '0.0.0.0',
+      strictPort: true,
       proxy: devProxy,
     },
     output: {