Add Docker, Woodpecker CI/CD, and dev proxy setup

- Add multi-stage Dockerfile (Vite build → Nginx serve)
- Add nginx.conf: serves SPA, proxies /api/ to yugioh-api:3000
- Add .woodpecker.yml pipeline (build + deploy on yugioh network, port 8041)
- Add .dockerignore
- Add .env.example with VITE_API_URL
- Update .gitignore to exclude .env files
- Update vite.config.js: proxy /api to backend in dev via VITE_API_URL
- Fix git remote push URLs (were pointing at Dashboard repo)

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

vite.config.js

@@ -1,7 +1,18 @@
-import { defineConfig } from 'vite'
+import { defineConfig, loadEnv } from 'vite'
 import react from '@vitejs/plugin-react'
 
-// https://vite.dev/config/
-export default defineConfig({
-  plugins: [react()],
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), '')
+  return {
+    plugins: [react()],
+    server: {
+      proxy: {
+        '/api': {
+          target: env.VITE_API_URL || 'http://localhost:3000',
+          changeOrigin: true,
+          rewrite: (path) => path.replace(/^\/api/, '')
+        }
+      }
+    }
+  }
 })