feat(forum): rebuild forum home page

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/forum/browser-smoke.cjs

@@ -69,7 +69,7 @@ async function run() {
     })
     await sleep(800)
     const result = await call('Runtime.evaluate', {
-      expression: `({forum:!!document.getElementById('forum'),posts:document.querySelectorAll('.jio-forum__post').length,locked:document.body.textContent.includes('内容已隐藏'),leaked:document.documentElement.innerHTML.includes('需要积分查看的正文'),overflow:document.documentElement.scrollWidth>document.documentElement.clientWidth,width:innerWidth})`,
+      expression: `({forum:!!document.getElementById('forum'),posts:document.querySelectorAll('.forum-posts').length,locked:document.body.textContent.includes('内容已隐藏'),leaked:document.documentElement.innerHTML.includes('需要积分查看的正文'),overflow:document.documentElement.scrollWidth>document.documentElement.clientWidth,width:innerWidth})`,
       returnByValue: true,
     })
     const state = result.result.value