Demo-Modus entfernt

isDemoMode war nie aktiv: appwrite.js hat immer eine Projekt-ID als
Fallback. Weg sind die Demo-Zweige in Anmeldung und Hooks sowie die
Beispieldaten aus der alten IT-Welt (Serverausfall, Drucker, Kunde A–E).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/context/AuthContext.jsx

@@ -7,14 +7,11 @@ import {
   ID,
   Query,
   hasAppwriteSession,
-  isDemoMode,
   projectId as PROJECT_ID,
 } from '../lib/appwrite'
 
 const AuthContext = createContext()
 
-const DEMO_MODE = isDemoMode
-
 function clearStaleAppwriteSessions() {
   if (typeof window === 'undefined' || !window.localStorage) return
   try {
@@ -55,7 +52,7 @@ async function createSessionWithCleanup(email, password) {
 // Hilfsfunktion: Fügt User automatisch zur employees Collection hinzu und liefert
 // den Mitarbeiter-Eintrag (Kürzel = Gitea-Name, siehe isWorksheetCreator) oder null
 async function ensureEmployeeExists(user) {
-  if (!user || DEMO_MODE) return null
+  if (!user) return null
 
   try {
     const response = await databases.listDocuments(
@@ -98,15 +95,6 @@ export function AuthProvider({ children }) {
   }, [])
 
   async function checkUser() {
-    if (DEMO_MODE) {
-      const demoUser = localStorage.getItem('demo_user')
-      if (demoUser) {
-        setUser(JSON.parse(demoUser))
-      }
-      setLoading(false)
-      return
-    }
-
     if (!hasAppwriteSession()) {
       setUser(null)
       setLoading(false)
@@ -131,13 +119,6 @@ export function AuthProvider({ children }) {
   }
 
   async function login(email, password) {
-    if (DEMO_MODE) {
-      const demoUser = { $id: 'demo', email, name: email.split('@')[0] }
-      localStorage.setItem('demo_user', JSON.stringify(demoUser))
-      setUser(demoUser)
-      return { success: true }
-    }
-
     try {
       const normalizedEmail = email.trim()
       const normalizedPassword = password.trim()
@@ -176,12 +157,6 @@ export function AuthProvider({ children }) {
   }
 
   async function logout() {
-    if (DEMO_MODE) {
-      localStorage.removeItem('demo_user')
-      setUser(null)
-      return
-    }
-
     try {
       await account.deleteSessions()
     } catch (error) {