feat: enhance login modal and avatar selection process

- Updated the login modal to include a user agreement section with clickable links to the user agreement and privacy policy.
- Improved button styling and layout for better user experience.
- Refactored avatar selection process to utilize local image paths, enhancing compatibility and reliability across different environments.
- Added utility functions for resolving avatar file paths and selecting images from the gallery or camera.

This update aims to streamline user interactions during login and avatar selection, ensuring a smoother experience.

miniprogram/utils/util.js

@@ -198,6 +198,108 @@ const toAvatarPath = url => {
   return url
 }
 
+/**
+ * chooseAvatar 返回的 avatarUrl 常为 http(s)://tmp/... ，渲染层可用的临时路径，但 wx.uploadFile 需本地文件路径。
+ * 约定：网络地址先 wx.downloadFile 得到 tempFilePath；已是 wxfile:// 则直接上传。
+ *
+ * @param {string} avatarUrl
+ * @returns {Promise<string>}
+ */
+function resolveChooseAvatarFilePath(avatarUrl) {
+  return new Promise((resolve, reject) => {
+    if (!avatarUrl || typeof avatarUrl !== 'string') {
+      reject(new Error('无效的头像路径'))
+      return
+    }
+    const trimmed = avatarUrl.trim()
+    if (!trimmed) {
+      reject(new Error('无效的头像路径'))
+      return
+    }
+    if (trimmed.startsWith('wxfile://')) {
+      resolve(trimmed)
+      return
+    }
+    if (/^https?:\/\//i.test(trimmed)) {
+      wx.downloadFile({
+        url: trimmed,
+        success: res => {
+          if (res.statusCode === 200 && res.tempFilePath) resolve(res.tempFilePath)
+          else {
+            wx.getImageInfo({
+              src: trimmed,
+              success: img => {
+                if (img.path) resolve(img.path)
+                else reject(new Error('图片获取失败'))
+              },
+              fail: () => reject(new Error('图片获取失败')),
+            })
+          }
+        },
+        fail: () => {
+          wx.getImageInfo({
+            src: trimmed,
+            success: img => {
+              if (img.path) resolve(img.path)
+              else reject(new Error('图片获取失败'))
+            },
+            fail: () => reject(new Error('图片获取失败')),
+          })
+        },
+      })
+      return
+    }
+    resolve(trimmed)
+  })
+}
+
+/**
+ * 相册/相机选头像用本地路径（供 wx.uploadFile），避开开发者工具里 chooseAvatar → http://tmp 渲染失败。
+ * 优先 chooseMedia，低版本兜底 chooseImage。
+ * @returns {Promise<string>}
+ */
+function pickLocalAvatarImagePath() {
+  return new Promise((resolve, reject) => {
+    const fail = err => {
+      const em = (err && (err.errMsg || err.message)) || ''
+      const s = String(em)
+      if (s.includes('cancel') || s.includes('取消')) reject(Object.assign(err || {}, { cancelled: true }))
+      else reject(err || new Error('选择图片失败'))
+    }
+    if (typeof wx.chooseMedia === 'function') {
+      wx.chooseMedia({
+        count: 1,
+        mediaType: ['image'],
+        sourceType: ['album', 'camera'],
+        sizeType: ['compressed'],
+        success: res => {
+          const files = res.tempFiles || []
+          const p = files[0] && files[0].tempFilePath
+          if (p) resolve(p)
+          else reject(new Error('未选择图片'))
+        },
+        fail,
+      })
+      return
+    }
+    if (typeof wx.chooseImage === 'function') {
+      wx.chooseImage({
+        count: 1,
+        sizeType: ['compressed'],
+        sourceType: ['album', 'camera'],
+        success: res => {
+          const arr = res.tempFilePaths || []
+          if (arr[0]) resolve(arr[0])
+          else reject(new Error('未选择图片'))
+        },
+        fail,
+      })
+      return
+    }
+    reject(new Error('当前环境不支持选择图片'))
+  })
+}
+
 module.exports = {
   formatTime,
   formatDate,
@@ -217,5 +319,7 @@ module.exports = {
   showLoading,
   hideLoading,
   showConfirm,
-  toAvatarPath
+  toAvatarPath,
+  resolveChooseAvatarFilePath,
+  pickLocalAvatarImagePath,
 }