style(user-center): 服务/空状态图标改线性 SVG Icon，去掉表情符号

- Profile 我的服务宫格 + My*/空状态 用 @/components/atoms 的 Icon atom(calendar/route/map-pin/shield)，禁止 emoji 图标
- user-center.css 补 uc-svc-icon/uc-empty-icon 尺寸与配色

website/src/styles/user-center.css

@@ -40,7 +40,8 @@
   transition: transform .2s var(--ease), box-shadow .2s var(--ease);
 }
 .uc-service:hover { transform: translateY(-3px); }
-.uc-service .i { font-size: 22px; line-height: 1; }
+.uc-service .i { font-size: 22px; line-height: 1; color: var(--primary); }
+.uc-service .i .uc-svc-icon { width: 22px; height: 22px; }
 .uc-service .t { font-weight: 600; font-size: 16px; }
 .uc-service .d { font-size: 13px; color: var(--muted); }
 .uc-service .d .badge { margin-left: 4px; }
@@ -68,7 +69,7 @@
 
 /* ---------- 空态 ---------- */
 .uc-empty { text-align: center; padding: 48px 20px; color: var(--muted); }
-.uc-empty .big { font-size: 44px; margin-bottom: 8px; opacity: .5; }
+.uc-empty .uc-empty-icon { width: 44px; height: 44px; color: var(--muted); opacity: .55; margin: 0 auto 10px; display: block; }
 
 /* ---------- 顶栏用户菜单（头像+用户名 胶囊 + 下拉） ---------- */
 .user-menu { position: relative; flex: 0 0 auto; }

website/src/user/MyBookings.jsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { ContentTemplate } from '@/components/templates';
+import { Icon } from '@/components/atoms';
 import AuthGate from '@/components/AuthGate';
 import { getUser } from '@/services/auth';
 import { myBookings } from '@/services/booking';
@@ -65,7 +66,7 @@ export default function MyBookings() {
           </div>
         ) : loaded ? (
           <div className="uc-empty uc-glass">
-            <div className="big">📋</div>
+            <Icon name="calendar" className="uc-empty-icon" />
             <p>还没有报名记录，去参加一场公益课或沙龙吧。</p>
             <a className="btn btn-cta" href="#/events">去看看活动 →</a>
           </div>

website/src/user/MyCert.jsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { ContentTemplate } from '@/components/templates';
+import { Icon } from '@/components/atoms';
 import AuthGate from '@/components/AuthGate';
 import { getUser } from '@/services/auth';
 import { getOpCertMine } from '@/services/opcProfile';
@@ -57,7 +58,7 @@ export default function MyCert() {
 
         {!certified && (
           <div className="uc-empty uc-glass" style={{ marginTop: 20 }}>
-            <div className="big">🏅</div>
+            <Icon name="shield" className="uc-empty-icon" />
             <p>{status === 'reviewing' ? '认证资料审核中，请耐心等待。' : '完成申请与认证流程，成为 OPC 创业伙伴。'}</p>
             <a className="btn btn-cta" href="#/cert-apply">去认证 →</a>
           </div>

website/src/user/MyPark.jsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { ContentTemplate } from '@/components/templates';
+import { Icon } from '@/components/atoms';
 import AuthGate from '@/components/AuthGate';
 import { getUser } from '@/services/auth';
 import { myParkAdmission } from '@/services/park';
@@ -58,7 +59,7 @@ export default function MyPark() {
 
         {loaded && !name && (
           <div className="uc-empty uc-glass" style={{ marginTop: 20 }}>
-            <div className="big">🏢</div>
+            <Icon name="map-pin" className="uc-empty-icon" />
             <p>你还没有提交园区入驻申请。</p>
             <a className="btn btn-cta" href="#/park-apply">去申请入驻 →</a>
           </div>

website/src/user/MyTasks.jsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { ContentTemplate } from '@/components/templates';
+import { Icon } from '@/components/atoms';
 import AuthGate from '@/components/AuthGate';
 import { getUser } from '@/services/auth';
 import { myTasks } from '@/services/tasks';
@@ -49,7 +50,7 @@ export default function MyTasks() {
           </div>
         ) : (
           <div className="uc-empty uc-glass">
-            <div className="big">🧩</div>
+            <Icon name="route" className="uc-empty-icon" />
             <p>还没有承接的任务，去任务广场看看吧。</p>
             <a className="btn btn-cta" href="#/tasks">去任务广场 →</a>
           </div>

website/src/user/Profile.jsx

@@ -174,10 +174,10 @@ export default function Profile() {
   }
 
   const svcGrid = [
-    ['📋', '我的报名', svc.bk == null ? '加载中…' : `${svc.bk} 条报名`, '#/my-bookings'],
-    ['🧩', '我的任务', svc.tk == null ? '加载中…' : `${svc.tk} 个任务`, '#/my-tasks'],
-    ['🏢', '我的园区', svc.park, '#/my-park'],
-    ['🏅', '我的认证', svc.cert, '#/my-cert'],
+    ['calendar', '我的报名', svc.bk == null ? '加载中…' : `${svc.bk} 条报名`, '#/my-bookings'],
+    ['route', '我的任务', svc.tk == null ? '加载中…' : `${svc.tk} 个任务`, '#/my-tasks'],
+    ['map-pin', '我的园区', svc.park, '#/my-park'],
+    ['shield', '我的认证', svc.cert, '#/my-cert'],
   ];
 
   return (
@@ -207,7 +207,7 @@ export default function Profile() {
         <div className="uc-grid">
           {svcGrid.map(([icon, t, d, href]) => (
             <a className="uc-service uc-glass" key={href} href={href}>
-              <span className="i">{icon}</span>
+              <span className="i"><Icon name={icon} className="uc-svc-icon" /></span>
               <span className="t">{t}</span>
               <span className="d">{d}</span>
             </a>