统一排行榜页：四角色七时段，对接 phbhqsj 新接口

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/utils/avatar.js

@@ -0,0 +1,19 @@
+/** 头像 URL 解析（排行榜等页面共用） */
+export function getDefaultAvatarUrl(app) {
+  const g = app || getApp();
+  const oss = g.globalData.ossImageUrl || '';
+  const def = g.globalData.morentouxiang || '';
+  if (!def) return '';
+  if (def.startsWith('http')) return def;
+  return oss + def.replace(/^\//, '');
+}
+
+export function resolveAvatarUrl(path, app) {
+  if (!path || path === 'null' || path === 'undefined') return '';
+  const s = String(path).trim();
+  if (!s) return '';
+  if (s.startsWith('http')) return s;
+  const g = app || getApp();
+  const oss = g.globalData.ossImageUrl || '';
+  return oss + s.replace(/^\//, '');
+}