feat: 添加相机和相册权限请求功能

- 在 AI 体态评估页面中集成相机和相册权限请求逻辑
- 更新 app.json 和 Info.plist，添加相应的权限说明
- 修改布局以支持照片上传功能，用户可上传正面、侧面和背面照片
- 更新 package.json 和 package-lock.json，添加 expo-image-picker 依赖

package-lock.json

@@ -20,6 +20,7 @@
         "expo-font": "~13.3.2",
         "expo-haptics": "~14.1.4",
         "expo-image": "~2.4.0",
+        "expo-image-picker": "~16.1.4",
         "expo-linear-gradient": "^14.1.5",
         "expo-linking": "~7.1.7",
         "expo-router": "~5.1.4",
@@ -6301,6 +6302,27 @@
         }
       }
     },
+    "node_modules/expo-image-loader": {
+      "version": "5.1.0",
+      "resolved": "https://mirrors.tencent.com/npm/expo-image-loader/-/expo-image-loader-5.1.0.tgz",
+      "integrity": "sha512-sEBx3zDQIODWbB5JwzE7ZL5FJD+DK3LVLWBVJy6VzsqIA6nDEnSFnsnWyCfCTSvbGigMATs1lgkC2nz3Jpve1Q==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
+    "node_modules/expo-image-picker": {
+      "version": "16.1.4",
+      "resolved": "https://mirrors.tencent.com/npm/expo-image-picker/-/expo-image-picker-16.1.4.tgz",
+      "integrity": "sha512-bTmmxtw1AohUT+HxEBn2vYwdeOrj1CLpMXKjvi9FKSoSbpcarT4xxI0z7YyGwDGHbrJqyyic3I9TTdP2J2b4YA==",
+      "license": "MIT",
+      "dependencies": {
+        "expo-image-loader": "~5.1.0"
+      },
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-keep-awake": {
       "version": "14.1.4",
       "resolved": "https://registry.npmjs.org/expo-keep-awake/-/expo-keep-awake-14.1.4.tgz",