build: 打通 FastAPI 与 Vue 最小工程、依赖与数据库连接

后端入口、配置、Redis 与 Alembic 迁移就位；前端 Vite 工程可安装可构建。

frontend/.env.example

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+# API URLs
+VITE_API_URL=http://localhost:8000/api/v1
+VITE_WS_URL=ws://localhost:8000
+VITE_WIDGET_URL=http://localhost:8000
+
+# Firebase Configuration
+VITE_FIREBASE_API_KEY=your_firebase_api_key_here
+VITE_FIREBASE_AUTH_DOMAIN=your_firebase_auth_domain_here
+VITE_FIREBASE_PROJECT_ID=your_firebase_project_id_here
+VITE_FIREBASE_MESSAGING_SENDER_ID=680125690355
+VITE_FIREBASE_APP_ID=your_firebase_app_id_here
+VITE_FIREBASE_STORAGE_BUCKET=your_firebase_storage_bucket_here
+VITE_FIREBASE_MEASUREMENT_ID=your_firebase_measurement_id_here
+VITE_FIREBASE_VAPID_KEY=your_firebase_vapid_key_here
+
+# Google Fonts API — OPTIONAL. Only powers the font picker in agent
+# customization; leave blank and a built-in font list is offered instead.
+# Must be your own key: Google API keys are HTTP-referrer restricted, so a key
+# issued for another domain returns 403 on yours. Get one at
+# https://console.cloud.google.com/apis/credentials (enable "Web Fonts Developer
+# API"), then restrict it to your app domain.
+# Leave BLANK rather than a placeholder — a non-empty value is treated as a real
+# key and the request goes out and fails.
+VITE_GOOGLE_FONTS_API_KEY=
+
+# Shopify API Key (for embedded apps) — optional, blank unless you ship one.
+VITE_SHOPIFY_API_KEY=
+
+
+
+# Node Environment
+NODE_ENV=development
+HOST=0.0.0.0