feat: bootstrap React frontend shell with API and realtime wiring

src/App.css

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+.app {
+  max-width: 900px;
+  margin: 2rem auto;
+  padding: 0 1rem;
+  font-family: Inter, system-ui, sans-serif;
+}
+
+.row {
+  display: flex;
+  gap: 8px;
+  margin: 10px 0;
+}
+
+input {
+  flex: 1;
+  padding: 8px;
+}
+
+button {
+  padding: 8px 12px;
+}
+
+.messages {
+  margin-top: 1rem;
+  padding-left: 1rem;
+}
+
+.messages li {
+  margin: 4px 0;
+}

src/App.tsx

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+import { useEffect, useMemo, useState } from 'react'
+import axios from 'axios'
+import { io, Socket } from 'socket.io-client'
+import './App.css'
+
+type Health = { ok: boolean; service: string; database?: string }
+type MessageItem = {
+  messageId: string
+  seq: number
+  content: string
+  createdAt: string
+  isDeleted?: boolean
+}
+
+const API_BASE = import.meta.env.VITE_GUILD_API_BASE ?? 'http://localhost:7002/api'
+const SOCKET_BASE = import.meta.env.VITE_GUILD_SOCKET_BASE ?? 'http://localhost:7002/realtime'
+const API_KEY = import.meta.env.VITE_API_KEY ?? 'change-me-api-key'
+
+function App() {
+  const [health, setHealth] = useState<Health | null>(null)
+  const [channelId, setChannelId] = useState('')
+  const [messages, setMessages] = useState<MessageItem[]>([])
+  const [content, setContent] = useState('')
+  const [socketState, setSocketState] = useState<'offline' | 'online'>('offline')
+
+  const client = useMemo(
+    () =>
+      axios.create({
+        baseURL: API_BASE,
+        headers: { 'x-api-key': API_KEY },
+      }),
+    [],
+  )
+
+  useEffect(() => {
+    client.get('/healthz').then((res) => setHealth(res.data)).catch(() => setHealth(null))
+  }, [client])
+
+  useEffect(() => {
+    if (!channelId) return
+
+    const socket: Socket = io(SOCKET_BASE, {
+      transports: ['websocket'],
+      auth: { apiKey: API_KEY, userId: 'frontend-user' },
+      extraHeaders: { 'x-api-key': API_KEY },
+    })
+
+    socket.on('connect', () => {
+      setSocketState('online')
+      socket.emit('join_channel', { channelId })
+    })
+
+    socket.on('disconnect', () => setSocketState('offline'))
+    socket.on('message.created', (m) => setMessages((prev) => [...prev, m]))
+    socket.on('message.updated', (m) =>
+      setMessages((prev) => prev.map((x) => (x.messageId === m.messageId ? m : x))),
+    )
+    socket.on('message.deleted', (m) =>
+      setMessages((prev) =>
+        prev.map((x) => (x.messageId === m.messageId ? { ...x, isDeleted: true, content: '[deleted]' } : x)),
+      ),
+    )
+
+    return () => {
+      socket.emit('leave_channel', { channelId })
+      socket.disconnect()
+      setSocketState('offline')
+    }
+  }, [channelId])
+
+  async function pullMessages() {
+    if (!channelId) return
+    const res = await client.get(`/channels/${channelId}/messages`, {
+      params: { seq_from: 1, seq_to: 999999, limit: 100 },
+    })
+    setMessages(res.data.items ?? [])
+  }
+
+  async function sendMessage() {
+    if (!channelId || !content.trim()) return
+    await client.post(`/channels/${channelId}/messages`, {
+      content,
+      authorUserId: 'frontend-user',
+    })
+    setContent('')
+  }
+
+  return (
+    <main className="app">
+      <h1>Fabric Frontend</h1>
+      <p>Health: {health ? `${health.service} (${health.database ?? 'ok'})` : 'unavailable'}</p>
+      <p>Socket: {socketState}</p>
+
+      <section className="row">
+        <input
+          value={channelId}
+          onChange={(e) => setChannelId(e.target.value)}
+          placeholder="Channel ID"
+        />
+        <button onClick={pullMessages}>拉取消息</button>
+      </section>
+
+      <section className="row">
+        <input
+          value={content}
+          onChange={(e) => setContent(e.target.value)}
+          placeholder="输入消息"
+        />
+        <button onClick={sendMessage}>发送</button>
+      </section>
+
+      <ul className="messages">
+        {messages.map((m) => (
+          <li key={m.messageId}>
+            <span>#{m.seq}</span> <span>{m.content}</span>
+          </li>
+        ))}
+      </ul>
+    </main>
+  )
+}
+
+export default App

src/assets/react.svg

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src/index.css

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+:root {
+  --text: #6b6375;
+  --text-h: #08060d;
+  --bg: #fff;
+  --border: #e5e4e7;
+  --code-bg: #f4f3ec;
+  --accent: #aa3bff;
+  --accent-bg: rgba(170, 59, 255, 0.1);
+  --accent-border: rgba(170, 59, 255, 0.5);
+  --social-bg: rgba(244, 243, 236, 0.5);
+  --shadow:
+    rgba(0, 0, 0, 0.1) 0 10px 15px -3px, rgba(0, 0, 0, 0.05) 0 4px 6px -2px;
+
+  --sans: system-ui, 'Segoe UI', Roboto, sans-serif;
+  --heading: system-ui, 'Segoe UI', Roboto, sans-serif;
+  --mono: ui-monospace, Consolas, monospace;
+
+  font: 18px/145% var(--sans);
+  letter-spacing: 0.18px;
+  color-scheme: light dark;
+  color: var(--text);
+  background: var(--bg);
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+
+  @media (max-width: 1024px) {
+    font-size: 16px;
+  }
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --text: #9ca3af;
+    --text-h: #f3f4f6;
+    --bg: #16171d;
+    --border: #2e303a;
+    --code-bg: #1f2028;
+    --accent: #c084fc;
+    --accent-bg: rgba(192, 132, 252, 0.15);
+    --accent-border: rgba(192, 132, 252, 0.5);
+    --social-bg: rgba(47, 48, 58, 0.5);
+    --shadow:
+      rgba(0, 0, 0, 0.4) 0 10px 15px -3px, rgba(0, 0, 0, 0.25) 0 4px 6px -2px;
+  }
+
+  #social .button-icon {
+    filter: invert(1) brightness(2);
+  }
+}
+
+#root {
+  width: 1126px;
+  max-width: 100%;
+  margin: 0 auto;
+  text-align: center;
+  border-inline: 1px solid var(--border);
+  min-height: 100svh;
+  display: flex;
+  flex-direction: column;
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+}
+
+h1,
+h2 {
+  font-family: var(--heading);
+  font-weight: 500;
+  color: var(--text-h);
+}
+
+h1 {
+  font-size: 56px;
+  letter-spacing: -1.68px;
+  margin: 32px 0;
+  @media (max-width: 1024px) {
+    font-size: 36px;
+    margin: 20px 0;
+  }
+}
+h2 {
+  font-size: 24px;
+  line-height: 118%;
+  letter-spacing: -0.24px;
+  margin: 0 0 8px;
+  @media (max-width: 1024px) {
+    font-size: 20px;
+  }
+}
+p {
+  margin: 0;
+}
+
+code,
+.counter {
+  font-family: var(--mono);
+  display: inline-flex;
+  border-radius: 4px;
+  color: var(--text-h);
+}
+
+code {
+  font-size: 15px;
+  line-height: 135%;
+  padding: 4px 8px;
+  background: var(--code-bg);
+}

src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)