Add urapt-web: web UI for urapt-server instances

A Vite + React 18 + TypeScript SPA, same-origin with the API (no CORS,
no Go server changes). Full management parity with the urapt CLI:

- First-run setup (admin bootstrap via needs_setup), login/logout
- Repositories: list, create, tabbed detail (overview edit/delete,
  members CRUD, distributions/components/architectures manager,
  package list + .deb upload + detail + delete, apt-config panel)
- API tokens: show-once creation + revoke
- Admin users: toggle admin / delete
- Settings + dark mode

Stack: Tailwind + shadcn/ui (New York), React Router v7 (lazy routes),
TanStack Query v5, Zustand, Vitest. Hand-written typed API client
mirroring shared/api + shared/models. Dev proxy forwards /api + /apt
to a local urapt-server; deploy behind nginx/Caddy (see urapt-web/README).

urapt-web/vite.config.ts

@@ -0,0 +1,49 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import path from "node:path";
+
+const SERVER_TARGET = process.env.URAPT_SERVER ?? "http://localhost:8080";
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      // Same-origin dev: forward API + APT endpoints to a local urapt-server.
+      "/api": { target: SERVER_TARGET, changeOrigin: true },
+      "/apt": { target: SERVER_TARGET, changeOrigin: true },
+    },
+  },
+  build: {
+    chunkSizeWarningLimit: 600,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          "react-vendor": ["react", "react-dom", "react-router-dom"],
+          "query-vendor": ["@tanstack/react-query"],
+          "radix-vendor": [
+            "@radix-ui/react-dialog",
+            "@radix-ui/react-dropdown-menu",
+            "@radix-ui/react-select",
+            "@radix-ui/react-tabs",
+            "@radix-ui/react-toast",
+            "@radix-ui/react-tooltip",
+          ],
+        },
+      },
+    },
+  },
+  test: {
+    globals: true,
+    environment: "jsdom",
+    setupFiles: ["./src/test/setup.ts"],
+    css: false,
+  },
+});