refactor(api): split monolithic handlers.go into focused modules

Break down the 627-line handlers.go into specialized modules:
- handlers_chat.go: chat and streaming endpoints
- handlers_config.go: configuration endpoints
- handlers_common.go: shared utilities
- handlers_info.go: info and status endpoints
- handlers_terminal.go: terminal/shell endpoints
- handlers_tools.go: tool-related endpoints

Also includes config improvements, orchestrator enhancements, and
web component updates.

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

web/src/components/App.jsx

@@ -14,6 +14,7 @@ export default function App() {
   const [clock, setClock] = useState(new Date())
   const [updates, setUpdates] = useState([])
   const [tools, setTools] = useState([])
+  const [config, setConfig] = useState(null)
   const { t, layout } = useI18n()
 
   const TABS = useMemo(() => [
@@ -27,7 +28,13 @@ export default function App() {
     api.getInfo().then(setInfo).catch(() => {})
     api.getTools().then(d => setTools(d.tools || [])).catch(() => {})
     api.getUpdates().then(d => setUpdates(d.updates || [])).catch(() => {})
-    applyTheme(getTheme('cyberpunk-red'))
+    api.getConfig().then(d => {
+      setConfig(d)
+      const theme = d.profile?.preferences?.theme || 'cyberpunk-red'
+      applyTheme(getTheme(theme))
+    }).catch(() => {
+      applyTheme(getTheme('cyberpunk-red'))
+    })
   }, [])
 
   useEffect(() => {
@@ -57,7 +64,7 @@ export default function App() {
   const switchTab = useCallback((tabId) => setActiveTab(tabId), [])
 
   const hasUpdates = updates.some(u => u.needsUpdate)
-  const installed = tools.filter(t => t.installed).length
+  const installed = tools.filter(tool => tool.installed).length
 
   const WINDOW_SHORTCUTS = useMemo(() => ({
     dash: [
@@ -80,10 +87,10 @@ export default function App() {
 
   const renderContent = () => {
     switch (activeTab) {
-      case 'dash': return <Dashboard tools={tools} updates={updates} api={api} onRescan={t => setTools(t)} />
+      case 'dash': return <Dashboard api={api} />
       case 'studio': return <Studio api={api} />
       case 'shell': return <Shell api={api} />
-      case 'config': return <Config api={api} onThemeChange={() => {}} />
+      case 'config': return <Config api={api} />
       default: return null
     }
   }