首次提交：脑晴测 H5 项目

包含前端源码、预构建产物（dist/）、零依赖 Node.js 服务器（server.mjs）、
Cloudflare Worker 版本（worker/）、部署文档（DEPLOY.md）和交接文档。

技术总监可直接 clone 后运行 node server.mjs 启动，无需安装 React 或 build。
DEEPSEEK_API_KEY 通过环境变量注入，未纳入仓库。

brain-h5/src/mobile/geometry.ts

@@ -0,0 +1,68 @@
+export type MobileDeviceGeometry = {
+  device: {
+    width: number;
+    height: number;
+  };
+  screen: {
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+    radius: number;
+  };
+  safeArea: {
+    top: number;
+    bottom: number;
+  };
+  keyboard: {
+    height: number;
+  };
+};
+
+export const iphoneGeometry = {
+  // CSS-space coordinates for the 3x iPhone assets. Keep source PNG dimensions
+  // divisible by 3 so the rendered phone frame lands on whole CSS pixels.
+  device: {
+    width: 511,
+    height: 968,
+  },
+  screen: {
+    x: 59,
+    y: 58,
+    width: 393,
+    height: 852,
+    radius: 42,
+  },
+  safeArea: {
+    top: 54,
+    bottom: 34,
+  },
+  keyboard: {
+    height: 338,
+  },
+} as const satisfies MobileDeviceGeometry;
+
+export const pixelGeometry = {
+  // Pixel10.png is a 2x asset. Its 854 x 1904 screen opening renders at
+  // exactly 427 x 952 CSS pixels inside the 566 x 1022 asset canvas.
+  device: {
+    width: 566,
+    height: 1022,
+  },
+  screen: {
+    x: 70,
+    y: 35,
+    width: 427,
+    height: 952,
+    radius: 58,
+  },
+  safeArea: {
+    top: 64,
+    bottom: 48,
+  },
+  keyboard: {
+    height: 316,
+  },
+} as const satisfies MobileDeviceGeometry;
+
+export type IPhoneGeometry = typeof iphoneGeometry;