feat: remove global admin, open registration, clear DB seed

- All users are equal — no is_admin superuser
- Removed AdminPanel, Shield button from sidebar
- isOwnerOrAdmin checks only by chat role (owner/admin)
- Removed auto-seed of admin user on startup
- DB already cleared on server

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/db.ts

@@ -1,5 +1,4 @@
 import { Pool } from 'pg';
-import bcrypt from 'bcryptjs';
 
 export const pool = new Pool({ connectionString: process.env.DATABASE_URL });
 
@@ -94,14 +93,5 @@ export async function initDB() {
     ALTER TABLE chat_members ADD COLUMN IF NOT EXISTS is_pinned BOOLEAN DEFAULT FALSE;
   `);
 
-  // Seed admin if no users
-  const { rows } = await pool.query('SELECT COUNT(*) FROM users');
-  if (parseInt(rows[0].count) === 0) {
-    const hash = await bcrypt.hash('admin123', 10);
-    await pool.query(
-      `INSERT INTO users (username, display_name, password_hash, is_admin) VALUES ($1,$2,$3,TRUE)`,
-      ['admin', 'Администратор', hash]
-    );
-    console.log('Created admin user: admin / admin123');
-  }
+  // No auto-seed — users register themselves
 }

backend/src/routes/chats.ts

@@ -339,13 +339,13 @@ export default async function chatRoutes(app: FastifyInstance) {
 
   // Delete chat (owner only)
   app.delete('/:id', async (req, reply) => {
-    const { id: userId, isAdmin } = req.user as { id: string; isAdmin: boolean };
+    const { id: userId } = req.user as { id: string };
     const { id } = req.params as { id: string };
 
     const { rows: [member] } = await pool.query(
       'SELECT role FROM chat_members WHERE chat_id = $1 AND user_id = $2', [id, userId]
     );
-    if (!member || (member.role !== 'owner' && !isAdmin)) {
+    if (!member || member.role !== 'owner') {
       return reply.status(403).send({ error: 'No permission' });
     }
 

frontend/src/components/ChatHeader.tsx

@@ -42,7 +42,7 @@ export default function ChatHeader({ chat, onBack, onRefresh, onShowInfo }: Prop
     subtitle = `${chat.memberCount} участников`;
   }
 
-  const isOwnerOrAdmin = chat.myRole === 'owner' || chat.myRole === 'admin' || user?.isAdmin;
+  const isOwnerOrAdmin = chat.myRole === 'owner' || chat.myRole === 'admin';
 
   async function handleLeave() {
     if (!confirm('Выйти из чата?')) return;

frontend/src/components/ChatInfoPanel.tsx

@@ -23,7 +23,7 @@ export default function ChatInfoPanel({ chat, onClose, onRefresh }: Props) {
   const [uploadingAvatar, setUploadingAvatar] = useState(false);
   const fileRef = useRef<HTMLInputElement>(null);
 
-  const isOwnerOrAdmin = chat.myRole === 'owner' || chat.myRole === 'admin' || me?.isAdmin;
+  const isOwnerOrAdmin = chat.myRole === 'owner' || chat.myRole === 'admin';
 
   useEffect(() => {
     if (addMode) {

frontend/src/pages/MainLayout.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { Search, Edit, Settings, Shield, Wifi, WifiOff, MessageCircle } from 'lucide-react';
+import { Search, Edit, Settings, Wifi, WifiOff, MessageCircle } from 'lucide-react';
 import { useStore } from '../store';
 import { wsClient } from '../api/ws';
 import api from '../api/client';
@@ -9,7 +9,6 @@ import MessageList from '../components/MessageList';
 import ChatHeader from '../components/ChatHeader';
 import ChatInfoPanel from '../components/ChatInfoPanel';
 import NewChatModal from '../components/NewChatModal';
-import AdminPanel from '../components/admin/AdminPanel';
 import ProfileModal from '../components/ProfileModal';
 import { usePushNotifications } from '../hooks/usePushNotifications';
 import { Chat } from '../types';
@@ -19,7 +18,6 @@ export default function MainLayout() {
   const [search, setSearch] = useState('');
   const [searchUsers, setSearchUsers] = useState<any[]>([]);
   const [showNew, setShowNew] = useState(false);
-  const [showAdmin, setShowAdmin] = useState(false);
   const [showInfo, setShowInfo] = useState(false);
   const [showProfile, setShowProfile] = useState(false);
   const [mobileChatOpen, setMobileChatOpen] = useState(false);
@@ -132,7 +130,7 @@ export default function MainLayout() {
     if (!activeChat) return false;
     if (activeChat.type === 'private') return true;
     if (activeChat.type === 'group') return activeChat.canSendMessages !== false;
-    if (activeChat.type === 'channel') return activeChat.myRole === 'owner' || activeChat.myRole === 'admin' || !!user?.isAdmin;
+    if (activeChat.type === 'channel') return activeChat.myRole === 'owner' || activeChat.myRole === 'admin';
     return false;
   })();
 
@@ -155,12 +153,6 @@ export default function MainLayout() {
               </div>
             </div>
             <div className="flex items-center gap-1">
-              {user?.isAdmin && (
-                <button onClick={() => setShowAdmin(true)}
-                  className="p-1.5 rounded-lg hover:bg-gray-100 text-gray-400 hover:text-gray-600" title="Панель администратора">
-                  <Shield className="w-4 h-4" />
-                </button>
-              )}
               <button onClick={() => setShowProfile(true)}
                 className="p-1.5 rounded-lg hover:bg-gray-100 text-gray-400 hover:text-gray-600" title="Профиль">
                 <Settings className="w-4 h-4" />
@@ -297,7 +289,6 @@ export default function MainLayout() {
           if (found) openChat(found);
         } catch {}
       }} />}
-      {showAdmin && <AdminPanel onClose={() => setShowAdmin(false)} />}
       {showProfile && <ProfileModal onClose={() => setShowProfile(false)} />}
     </div>
   );