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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web/src/components/Config.jsx

@@ -0,0 +1,98 @@
+import { useState, useEffect } from 'react'
+import { getThemeNames, applyTheme, getTheme } from '../themes'
+
+export default function Config({ api, theme, onThemeChange }) {
+  const [config, setConfig] = useState(null)
+  const [providers, setProviders] = useState([])
+  const [skillList, setSkillList] = useState([])
+
+  useEffect(() => {
+    api.getConfig().then(d => setConfig(d)).catch(() => {})
+    api.getProviders().then(d => setProviders(d.providers || [])).catch(() => {})
+    api.getSkills().then(d => setSkillList(d.skills || [])).catch(() => {})
+  }, [])
+
+  const themes = getThemeNames()
+
+  const handleThemeChange = (themeId) => {
+    const t = getTheme(themeId)
+    applyTheme(t)
+    onThemeChange(themeId)
+  }
+
+  return (
+    <div className="config-container">
+      <div className="config-section">
+        <div className="section-header">Profile</div>
+        {config?.profile && (
+          <div>
+            <Field label="Name" value={config.profile.name} />
+            <Field label="Pseudo" value={config.profile.pseudo} />
+            <Field label="Email" value={config.profile.email} />
+            <Field label="Editor" value={config.profile.preferences?.editor} />
+            <Field label="Shell" value={config.profile.preferences?.shell} />
+            <Field label="Default AI" value={config.profile.preferences?.defaultAI} />
+            <Field label="Languages" value={config.profile.languages?.join(', ')} />
+          </div>
+        )}
+      </div>
+
+      <div className="config-section">
+        <div className="section-header">AI Providers</div>
+        {providers.map((p, i) => (
+          <div key={i} className="config-field" style={{ flexDirection: 'column', alignItems: 'flex-start', gap: 4 }}>
+            <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
+              <span style={{ color: 'var(--text-bright)', fontWeight: 700 }}>{p.name}</span>
+              {p.active && <span style={{ color: 'var(--cyber-red)', fontSize: 11, fontWeight: 700 }}>{'>>'}</span>}
+            </div>
+            <div style={{ display: 'flex', gap: 16, fontSize: 12 }}>
+              <span style={{ color: 'var(--dim-red)' }}>model={p.model}</span>
+              <span style={{ color: p.apiKey ? 'var(--success)' : 'var(--error)' }}>
+                key={p.apiKey ? 'configured' : 'no key'}
+              </span>
+            </div>
+          </div>
+        ))}
+      </div>
+
+      <div className="config-section">
+        <div className="section-header">Theme</div>
+        <div style={{ display: 'flex', gap: 8, flexWrap: 'wrap' }}>
+          {themes.map(t => (
+            <button
+              key={t.id}
+              className={theme === t.id ? 'primary' : ''}
+              onClick={() => handleThemeChange(t.id)}
+            >
+              {t.name}
+            </button>
+          ))}
+        </div>
+      </div>
+
+      <div className="config-section">
+        <div className="section-header">Skills ({skillList.length})</div>
+        {skillList.length === 0 ? (
+          <span style={{ color: 'var(--text-muted)', fontSize: 12 }}>No skills. Run `muyue skills init`.</span>
+        ) : (
+          skillList.map((s, i) => (
+            <div key={i} className="tool-item">
+              <span className="tool-name">{s.name}</span>
+              <span style={{ color: 'var(--cyber-red)', fontSize: 11 }}>[{s.target || 'both'}]</span>
+              <span style={{ color: 'var(--dim-red)', fontSize: 11 }}>{s.description}</span>
+            </div>
+          ))
+        )}
+      </div>
+    </div>
+  )
+}
+
+function Field({ label, value }) {
+  return (
+    <div className="config-field">
+      <span className="config-label">{label}:</span>
+      <span className="config-value">{value || '-'}</span>
+    </div>
+  )
+}