refactor: unify into single muyue binary with embedded desktop mode

- Merge muyue + muyue-desktop into one binary (13MB)
- `muyue` starts TUI, `muyue desktop` launches web UI in browser
- Move frontend from cmd/muyue-desktop/frontend/ to web/ (standard Go layout)
- Add web/embed.go with //go:embed all:dist for frontend assets
- Add internal/desktop/ package (server, browser open, SPA routing, signals)
- Split internal/api/api.go into server.go + handlers.go
- Add internal/desktop/desktop.go with SPA fallback and --port/--no-open flags
- Clean package.json: remove unused @xterm/xterm, switch to ESM
- Fix vite.config.js proxy to use port 8095 for dev mode
- Add Makefile targets: frontend, desktop, dev-desktop
- Update all CI workflows: single binary build, web/ paths
- Remove cmd/muyue-desktop/ entirely

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Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/src/components/Dashboard.jsx

@@ -0,0 +1,121 @@
+import { useState, useEffect } from 'react'
+
+export default function Dashboard({ tools, updates, api, onRescan }) {
+  const [installing, setInstalling] = useState(false)
+  const [installLog, setInstallLog] = useState([])
+
+  const installed = tools.filter(t => t.installed).length
+  const total = tools.length
+  const pct = total > 0 ? (installed / total) * 100 : 0
+  const missing = tools.filter(t => !t.installed).map(t => t.Name || t.name)
+
+  const handleInstall = async () => {
+    if (missing.length === 0) return
+    setInstalling(true)
+    setInstallLog(prev => [...prev, { text: `Installing ${missing.length} tools...`, type: 'info' }])
+    try {
+      await api.installTools(missing)
+      setInstallLog(prev => [...prev, { text: 'Install started. Rescan to see changes.', type: 'ok' }])
+      const data = await api.runScan()
+      const toolData = await api.getTools()
+      onRescan(toolData.tools || [])
+    } catch (err) {
+      setInstallLog(prev => [...prev, { text: err.message, type: 'error' }])
+    }
+    setInstalling(false)
+  }
+
+  const handleScan = async () => {
+    await api.runScan()
+    const data = await api.getTools()
+    onRescan(data.tools || [])
+  }
+
+  return (
+    <div className="grid-2">
+      <div style={{ overflow: 'auto', padding: '4px' }}>
+        <div className="section-header">System</div>
+        <div style={{ marginBottom: 16 }}>
+          <span style={{ color: 'var(--text-main)' }}>{installed}/{total} tools installed</span>
+        </div>
+
+        <div className="section-header">Installed Tools</div>
+        <div style={{ marginBottom: 8 }}>
+          {tools.map((t, i) => (
+            <div key={i} className="tool-item">
+              <span className={`tool-status ${t.installed ? 'ok' : 'missing'}`}>
+                {t.installed ? '[OK]' : '[--]'}
+              </span>
+              <span className="tool-name">{t.Name || t.name}</span>
+              {(t.Version || t.version) && (
+                <span className="tool-version">{extractVersion(t.Version || t.version)}</span>
+              )}
+            </div>
+          ))}
+        </div>
+
+        <div className="progress-bar" style={{ marginBottom: 16 }}>
+          <div className="progress-fill" style={{ width: `${pct}%` }} />
+        </div>
+
+        {installing && (
+          <div style={{ marginBottom: 16 }}>
+            <span className="loading-spinner"> Installing...</span>
+          </div>
+        )}
+
+        {installLog.length > 0 && (
+          <div>
+            <div className="section-header">Install Log</div>
+            {installLog.map((log, i) => (
+              <div key={i} style={{
+                color: log.type === 'error' ? 'var(--error)' :
+                       log.type === 'ok' ? 'var(--success)' : 'var(--text-dim)',
+                fontSize: 12, padding: '2px 0'
+              }}>
+                {log.text}
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+
+      <div style={{ overflow: 'auto', padding: '4px' }}>
+        <div className="section-header">Quick Actions</div>
+        <div style={{ display: 'flex', flexDirection: 'column', gap: 6, marginBottom: 16 }}>
+          <button onClick={handleInstall} disabled={installing || missing.length === 0}>
+            [i] Install missing ({missing.length})
+          </button>
+          <button onClick={() => api.getUpdates().then(d => {})}> [u] Check updates</button>
+          <button onClick={handleScan}>[s] Rescan system</button>
+          <button onClick={() => api.configureMCP()}>[m] Configure MCP</button>
+        </div>
+
+        <div className="section-header">Updates</div>
+        <div style={{ marginBottom: 16 }}>
+          {updates.length === 0 ? (
+            <span style={{ color: 'var(--text-muted)' }}>No update data yet</span>
+          ) : updates.map((u, i) => (
+            <div key={i} className="tool-item">
+              <span className={`tool-status ${u.needsUpdate ? 'missing' : 'ok'}`}>
+                {u.needsUpdate ? '[!!]' : '[OK]'}
+              </span>
+              <span className="tool-name">{u.tool}</span>
+              {u.needsUpdate && (
+                <span style={{ color: 'var(--warning)', fontSize: 11 }}>
+                  {u.current} → {u.latest}
+                </span>
+              )}
+            </div>
+          ))}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function extractVersion(s) {
+  if (!s) return ''
+  const m = s.match(/\d+\.\d+\.\d+/)
+  return m ? m[0] : s.slice(0, 12)
+}