fix(badges): complete full-chain badge circuit and preset icons

Close the full circuit break in the badge/medal system and replace
empty default icons with preset SVG assets so badges render out of
the box:

- Add aksrt_get_worn_medal_icon() helper that renders the worn medal
  image inline (with settings fallback when the Badges class is
  unavailable).
- Profile header (UC) now shows the worn medal icon beside the name,
  matching zibll's name row order (display_name → VIP → Medal → Level → Verify).
- Add .medal-icon / .aksrt-identity-medal vertical-align rules in UC shell.css.
- Extract SchemaUsers::default_medal_args() and preset 6 badges (rookie,
  checkin-30, writer, popular, annual-star, vip-member) with real icon
  URLs from assets/img/medal/ (medal-1/2/5/9/12/15.svg).
- Vue badge.js: add MEDAL_BASE helper + preset icons matching PHP defaults.

assets/admin/src/schema/sections/users/badge.js

@@ -17,6 +17,14 @@ export const MEDAL_GET_TYPES = [
   { label: '仅手动授予', value: 'manually_add' },
 ]
 
+// Resolve medal SVG asset path from theme assets when running in admin context.
+const MEDAL_BASE = (() => {
+  const root = window.aksrtAdminData?.themeUri || ''
+  return root ? String(root).replace(/\/$/, '') + '/assets/img/medal' : '/assets/img/medal'
+})()
+
+const medalIcon = (n) => `${MEDAL_BASE}/medal-${n}.svg`
+
 export const defaultMedalArgs = () => [
   {
     cat_name: '成长',
@@ -25,7 +33,7 @@ export const defaultMedalArgs = () => [
         slug: 'rookie',
         name: '初出茅庐',
         desc: '注册时间超过30天',
-        icon: '',
+        icon: medalIcon(1),
         get_type: 'registration_time',
         get_val: 30,
       },
@@ -33,10 +41,26 @@ export const defaultMedalArgs = () => [
         slug: 'checkin-30',
         name: '签到达人',
         desc: '累计签到30天',
-        icon: '',
+        icon: medalIcon(2),
         get_type: 'checkin_all_day',
         get_val: 30,
       },
+      {
+        slug: 'writer',
+        name: '创作先锋',
+        desc: '发布10篇文章',
+        icon: medalIcon(5),
+        get_type: 'new_post',
+        get_val: 10,
+      },
+      {
+        slug: 'popular',
+        name: '人气之星',
+        desc: '累计获得100次点赞',
+        icon: medalIcon(9),
+        get_type: 'like',
+        get_val: 100,
+      },
     ],
   },
   {
@@ -46,7 +70,15 @@ export const defaultMedalArgs = () => [
         slug: 'annual-star',
         name: '年度人气达人',
         desc: '活动限定徽章',
-        icon: '',
+        icon: medalIcon(12),
+        get_type: 'manually_add',
+        get_val: 0,
+      },
+      {
+        slug: 'vip-member',
+        name: '尊贵会员',
+        desc: '给予 VIP 用户的特殊徽章',
+        icon: medalIcon(15),
         get_type: 'manually_add',
         get_val: 0,
       },