feat: 添加健康咨询页面及相关功能

- 在应用中新增健康咨询页面，展示用户健康数据和建议
- 集成 expo-linear-gradient 以实现页面背景渐变效果
- 更新 package.json 和 package-lock.json，添加 expo-linear-gradient 依赖
- 在首页中添加健康咨询的导航链接
- 修改布局以支持新页面的显示和交互

ios/Podfile.lock

@@ -51,6 +51,8 @@ PODS:
     - SDWebImageWebPCoder (~> 0.14.6)
   - ExpoKeepAwake (14.1.4):
     - ExpoModulesCore
+  - ExpoLinearGradient (14.1.5):
+    - ExpoModulesCore
   - ExpoLinking (7.1.7):
     - ExpoModulesCore
   - ExpoModulesCore (2.5.0):
@@ -2107,6 +2109,7 @@ DEPENDENCIES:
   - ExpoHead (from `../node_modules/expo-router/ios`)
   - ExpoImage (from `../node_modules/expo-image/ios`)
   - ExpoKeepAwake (from `../node_modules/expo-keep-awake/ios`)
+  - ExpoLinearGradient (from `../node_modules/expo-linear-gradient/ios`)
   - ExpoLinking (from `../node_modules/expo-linking/ios`)
   - ExpoModulesCore (from `../node_modules/expo-modules-core`)
   - ExpoSplashScreen (from `../node_modules/expo-splash-screen/ios`)
@@ -2227,6 +2230,8 @@ EXTERNAL SOURCES:
     :path: "../node_modules/expo-image/ios"
   ExpoKeepAwake:
     :path: "../node_modules/expo-keep-awake/ios"
+  ExpoLinearGradient:
+    :path: "../node_modules/expo-linear-gradient/ios"
   ExpoLinking:
     :path: "../node_modules/expo-linking/ios"
   ExpoModulesCore:
@@ -2404,6 +2409,7 @@ SPEC CHECKSUMS:
   ExpoHead: a7b66cbaeeb51f4a85338d335a0f5467e29a2c90
   ExpoImage: e4102c93d1dbe99ff54b075452d1bc9d6ec21b7c
   ExpoKeepAwake: bf0811570c8da182bfb879169437d4de298376e7
+  ExpoLinearGradient: 7734c8059972fcf691fb4330bcdf3390960a152d
   ExpoLinking: d5c183998ca6ada66ff45e407e0f965b398a8902
   ExpoModulesCore: 00a1b5c73248465bd0b93f59f8538c4573dac579
   ExpoSplashScreen: 0ad5acac1b5d2953c6e00d4319f16d616f70d4dd