Schulportal-Konventionen übernommen: Dark Mode (ThemeToggle), beispieldaten.py + generated.json, kimi.md, mail-server (Postfix-Relay + API), Deploy-Workflow (pscp/plink, npm_default), Screenshots in preview/

src/main.tsx

@@ -2,8 +2,11 @@ import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { BrowserRouter } from 'react-router'
 import './index.css'
+import { initTheme } from './lib/theme'
 import App from './App.tsx'
 
+initTheme()
+
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <BrowserRouter>