feat(screen): 园区大屏园区资讯 widget

- ParkFeed 拉取 /park/api/content/feed，滚动展示本园区内容标题；图标用 @appica/icons-react(禁用emoji)
- DataScreen 挂载 ParkFeed

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/ParkFeed.jsx

@@ -0,0 +1,33 @@
+import React, { useEffect, useState } from 'react';
+import { Broadcast } from '@appica/icons-react';
+import { getApiBase } from '../config';
+import '../styles/datascreen.css';
+
+/** 园区资讯 widget：拉取本园区内容(/park/api/content/feed)，滚动展示标题（大屏）。 */
+export default function ParkFeed() {
+  const [items, setItems] = useState([]);
+  useEffect(() => {
+    let alive = true;
+    fetch(`${getApiBase()}/api/content/feed`, { cache: 'no-store' })
+      .then((r) => r.json())
+      .then((d) => { if (alive) setItems(Array.isArray(d?.items) ? d.items : []); })
+      .catch(() => {});
+    return () => { alive = false; };
+  }, []);
+  if (!items.length) return null;
+  return (
+    <div className="bd-feed" style={{ marginTop: 12 }}>
+      <div className="bd-ticker-title"><Broadcast size={12} style={{ verticalAlign: '-1px', marginRight: 6 }} />园区资讯 <span>({items.length})</span></div>
+      <div className="bd-ticker">
+        <div className="bd-ticker-inner">
+          {[...items, ...items].map((c, i) => (
+            <div className="bd-ticker-item" key={i} title={c.title}>
+              <span className="bd-ticker-dot" />
+              {c.title}
+            </div>
+          ))}
+        </div>
+      </div>
+    </div>
+  );
+}

src/pages/DataScreen.jsx

@@ -2,6 +2,7 @@ import { useState, useEffect, useRef } from 'react';
 import '../styles/datascreen.css';
 import Icon from '../components/Icons';
 import ParkOverviewStrip from '../components/ParkOverviewStrip';
+import ParkFeed from '../components/ParkFeed';
 import { useParkSim } from '../utils/parkData';
 
 /* =========================================================
@@ -576,6 +577,8 @@ export default function DataScreen() {
         </div>
       </section>
 
+      <ParkFeed />
+
       {/* 园区概览（保持在最底部） */}
       <ParkOverviewStrip d={d} />
     </div>