Initial commit with Email Import Wizard and Task Processor updates

paperless-frontend/src/utils/env.ts

@@ -0,0 +1,9 @@
+/**
+ * Gibt eine Umgebungsvariable zurück.
+ * Priorisierung: window.__ENV__ (Docker Runtime) > import.meta.env (Vite Build-Time)
+ */
+export function getEnv(key: string): string {
+  const runtimeEnv = (window as any).__ENV__;
+  if (runtimeEnv?.[key]) return runtimeEnv[key];
+  return (import.meta.env as any)[key] ?? '';
+}