feat: complete deploy demo with React UI

Backend:
- Spring Boot 3.4, Java 21, REST API for app lifecycle
- Build pipeline: JAR → Dockerfile → docker build/push → kubectl apply
- In-memory state with K8s reconciliation on startup
- Configurable via env vars

Frontend:
- React 19 + @cameleer/design-system v0.1.26
- Dashboard table with status polling (5s)
- Deploy dialog with drag-and-drop JAR upload
- Resource limit/request configuration
- Environment variable editor
- Build log viewer
- Delete with confirmation dialog

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/vite.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+const apiTarget = process.env.VITE_API_TARGET || 'http://localhost:8082';
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 5174,
+    proxy: {
+      '/api/': {
+        target: apiTarget,
+        changeOrigin: true,
+        secure: false,
+      },
+    },
+  },
+  build: {
+    outDir: 'dist',
+  },
+});