feat: 扫描报告页+手动选波长护理+光疗功效介绍页+诊断框架(占位阈值)

- services/diagnosis.js: 诊断流水线框架,阈值/PD映射为占位待标定,支持单波长降级
- auto-scan: 扫描完成改为出报告让用户选择护理(替代原自动开始治疗)
- 新增 scan-report/manual-treatment/light-info 三页,全部接入 i18n
- api.js: 新增 report/diagnosis-config 接口(对接后端契约)

miniprogram/pages/light-info/light-info.js

@@ -0,0 +1,34 @@
+var i18n = require('../../i18n/index')
+
+Page({
+  data: {
+    statusBarHeight: 44,
+    // Ordered list of lights; strings live in i18n under lightInfo.lights[key],
+    // colors are presentation-only and stay in JS.
+    lights: [
+      { key: 'red', color: '#E8503A' },
+      { key: 'uv', color: '#7C4DFF' },
+      { key: 'yellow', color: '#F5B841' },
+      { key: 'infrared', color: '#8B2E3C' }
+    ],
+    // Parallel to i18n.lightInfo.modes (matched by index).
+    modeColors: ['#E8503A', '#7C4DFF', '#F5B841', '#8B2E3C', '#F08AA8']
+  },
+
+  onLoad: function () {
+    var app = getApp()
+    this.setData({ statusBarHeight: app.globalData.statusBarHeight })
+  },
+
+  onShow: function () {
+    i18n.bind(this)
+  },
+
+  onBack: function () {
+    wx.navigateBack({
+      fail: function () {
+        wx.switchTab({ url: '/pages/profile/profile' })
+      }
+    })
+  }
+})