Enhance SEO and feedback features across the application

- Updated index.html with improved meta tags for SEO, including author and theme color.
- Added a feedback dialog in ImprintContainer.vue for user feedback submission.
- Refactored LoginForm.vue to utilize a utility for cookie management, simplifying profile persistence.
- Introduced new routes and schemas for feedback in the router and server, enhancing SEO and user experience.
- Improved ChatView.vue with better error handling and command table display.
- Implemented feedback API endpoints in server routes for managing user feedback submissions and admin access.

These changes collectively improve the application's SEO, user interaction, and feedback management capabilities.

server/chat-auth.js

@@ -0,0 +1,73 @@
+import crypto from 'crypto';
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs';
+import { join } from 'path';
+
+const CHAT_USERS_FILE_NAME = 'chat-users.json';
+
+function ensureLogsDir(baseDir) {
+  const logsDir = join(baseDir, '../logs');
+  if (!existsSync(logsDir)) {
+    mkdirSync(logsDir, { recursive: true });
+  }
+  return logsDir;
+}
+
+function getChatUsersPath(baseDir) {
+  return join(ensureLogsDir(baseDir), CHAT_USERS_FILE_NAME);
+}
+
+function sha256(value) {
+  return crypto.createHash('sha256').update(value).digest('hex');
+}
+
+export function ensureChatUsersFile(baseDir) {
+  const usersPath = getChatUsersPath(baseDir);
+  if (existsSync(usersPath)) return;
+  writeFileSync(usersPath, '[]\n', 'utf-8');
+  console.warn(
+    `[Auth] ${CHAT_USERS_FILE_NAME} wurde neu erstellt. Bitte mindestens einen Admin-User mit Passwort-Hash konfigurieren.`
+  );
+}
+
+export function loadChatUsers(baseDir) {
+  ensureChatUsersFile(baseDir);
+  const usersPath = getChatUsersPath(baseDir);
+  const raw = readFileSync(usersPath, 'utf-8').trim();
+  if (!raw) return [];
+
+  let users = [];
+  try {
+    users = JSON.parse(raw);
+  } catch (error) {
+    throw new Error(`Ungültige ${CHAT_USERS_FILE_NAME}: ${error.message}`);
+  }
+
+  if (!Array.isArray(users)) {
+    throw new Error(`${CHAT_USERS_FILE_NAME} muss ein Array sein`);
+  }
+
+  return users
+    .filter((entry) => entry && typeof entry.username === 'string')
+    .map((entry) => ({
+      username: entry.username.trim(),
+      passwordHash: typeof entry.passwordHash === 'string' ? entry.passwordHash.trim() : '',
+      rights: Array.isArray(entry.rights) ? entry.rights.map((r) => String(r).toLowerCase()) : []
+    }))
+    .filter((entry) => entry.username && entry.passwordHash);
+}
+
+export function verifyChatUser(baseDir, username, password) {
+  if (!username || !password) return null;
+  const normalizedUser = String(username).trim();
+  const passwordHash = sha256(password);
+  const user = loadChatUsers(baseDir).find(
+    (entry) => entry.username.toLowerCase() === normalizedUser.toLowerCase() && entry.passwordHash === passwordHash
+  );
+
+  if (!user) return null;
+
+  return {
+    username: user.username,
+    rights: new Set(user.rights)
+  };
+}