Enhance mini program environment configuration and chapter loading logic

- Introduced a debugging environment configuration in app.js, allowing for dynamic API endpoint selection based on the environment.
- Implemented lazy loading for chapter parts in chapters.js, improving performance by only fetching necessary data.
- Updated UI elements in chapters.wxml to reflect changes in chapter loading and added loading indicators.
- Enhanced error handling and data management for chapter retrieval, ensuring a smoother user experience.
- Added functionality for switching API environments in settings.js, visible only in development mode.

miniprogram/app.js

@@ -5,12 +5,42 @@
 
 const { parseScene } = require('./utils/scene.js')
 
+// 调试环境配置：''=自动 | localhost | souldev | soulapi
+const DEBUG_ENV_OPTIONS = [
+  { key: '', label: '自动', url: null },
+  { key: 'localhost', label: '本地', url: 'http://localhost:8080' },
+  { key: 'souldev', label: '测试', url: 'https://souldev.quwanzhi.com' },
+  { key: 'soulapi', label: '正式', url: 'https://soulapi.quwanzhi.com' }
+]
+const STORAGE_KEY_DEBUG_ENV = 'debug_env_override'
+
+// 根据小程序环境版本或调试覆盖选择 API 地址
+function getBaseUrlByEnv(override) {
+  if (override) {
+    const opt = DEBUG_ENV_OPTIONS.find(o => o.key === override)
+    if (opt && opt.url) return opt.url
+  }
+  try {
+    const accountInfo = wx.getAccountInfoSync()
+    const env = accountInfo?.miniProgram?.envVersion || 'release'
+    const urls = {
+      develop: 'http://localhost:8080',          // 开发版（本地调试）
+      trial: 'https://souldev.quwanzhi.com',    // 体验版
+      release: 'https://soulapi.quwanzhi.com'   // 正式版
+    }
+    return urls[env] || urls.release
+  } catch (e) {
+    console.warn('[App] 获取环境失败，使用正式版:', e)
+    return 'https://soulapi.quwanzhi.com'
+  }
+}
+
 App({
   globalData: {
-    // API基础地址 - 连接真实后端
-    //  baseUrl: 'https://soulapi.quwanzhi.com',
-    // baseUrl: 'https://souldev.quwanzhi.com',
-    baseUrl: 'http://localhost:8080',
+    // API基础地址 - 由 getBaseUrlByEnv() 在 onLaunch 时按环境自动设置
+    baseUrl: '',
+    // 调试环境覆盖：'' | localhost | souldev | soulapi，持久化到 storage
+    debugEnvOverride: '',
     
     
     // 小程序配置 - 真实AppID
@@ -70,6 +100,8 @@ App({
   },
 
   onLaunch(options) {
+    this.globalData.debugEnvOverride = wx.getStorageSync(STORAGE_KEY_DEBUG_ENV) || ''
+    this.globalData.baseUrl = getBaseUrlByEnv(this.globalData.debugEnvOverride)
     this.globalData.readSectionIds = wx.getStorageSync('readSectionIds') || []
     // 获取系统信息
     this.getSystemInfo()
@@ -248,6 +280,28 @@ App({
     return ''
   },
 
+  // 调试：获取当前 API 环境信息
+  getDebugEnvInfo() {
+    const override = this.globalData.debugEnvOverride || ''
+    const opt = DEBUG_ENV_OPTIONS.find(o => o.key === override)
+    return {
+      override,
+      label: opt ? opt.label : '自动',
+      baseUrl: this.globalData.baseUrl
+    }
+  },
+
+  // 调试：一键切换 API 环境（自动→本地→测试→正式→自动），持久化到 storage
+  switchDebugEnv() {
+    const idx = DEBUG_ENV_OPTIONS.findIndex(o => o.key === this.globalData.debugEnvOverride)
+    const nextIdx = (idx + 1) % DEBUG_ENV_OPTIONS.length
+    const next = DEBUG_ENV_OPTIONS[nextIdx]
+    this.globalData.debugEnvOverride = next.key
+    this.globalData.baseUrl = getBaseUrlByEnv(next.key)
+    wx.setStorageSync(STORAGE_KEY_DEBUG_ENV, next.key)
+    return next
+  },
+
   /**
    * 自定义导航栏「返回」：有上一页则返回，否则跳转首页（解决从分享进入时点返回无效的问题）
    */