restructure to react spa + hono api, fix missing server/ and lib/

rewrite from monolithic hono jsx to react 19 spa with tanstack router
+ hono json api backend. add scan, review, execute, nodes, and setup
pages. multi-stage dockerfile (node for vite build, bun for runtime).

previously, server/ and src/shared/lib/ were silently excluded by
global gitignore patterns (/server/ from emacs, lib/ from python).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,28 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react-swc';
+import tailwindcss from '@tailwindcss/vite';
+import { TanStackRouterVite } from '@tanstack/router-plugin/vite';
+import { resolve } from 'node:path';
+
+export default defineConfig({
+	plugins: [
+		TanStackRouterVite({ target: 'react', autoCodeSplitting: true }),
+		react(),
+		tailwindcss(),
+	],
+	resolve: {
+		alias: {
+			'~': resolve(__dirname, 'src'),
+		},
+	},
+	server: {
+		port: 5173,
+		proxy: {
+			'/api': { target: 'http://localhost:3000', changeOrigin: true },
+		},
+	},
+	build: {
+		outDir: 'dist',
+		emptyOutDir: true,
+	},
+});