feat: 添加分享结果卡片功能，形成用户增长闭环

- 新增 ShareCardModal 组件，支持餐厅匹配和盲盒契约两种分享卡片
- 卡片包含品牌标识、匹配结果、餐厅/想法详情、二维码
- 使用 html-to-image 生成高清 PNG，支持保存图片和 Web Share API 分享
- 餐厅图片通过 canvas 转 data URL 处理跨域
- 集成到 MatchResult（极速救场）和 BlindBox reveal（周末契约）

package-lock.json

@@ -12,6 +12,7 @@
         "bcryptjs": "^3.0.3",
         "canvas-confetti": "^1.9.4",
         "framer-motion": "^12.34.3",
+        "html-to-image": "^1.11.13",
         "lucide-react": "^0.575.0",
         "next": "16.1.6",
         "prisma": "^6.19.2",
@@ -4260,6 +4261,12 @@
         "hermes-estree": "0.25.1"
       }
     },
+    "node_modules/html-to-image": {
+      "version": "1.11.13",
+      "resolved": "https://registry.npmjs.org/html-to-image/-/html-to-image-1.11.13.tgz",
+      "integrity": "sha512-cuOPoI7WApyhBElTTb9oqsawRvZ0rHhaHwghRLlTuffoD1B2aDemlCruLeZrUIIdvG7gs9xeELEPm6PhuASqrg==",
+      "license": "MIT"
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",