MVP-1: helpdesk core with dashboard, Telegram channel, customer portal

Next.js 16 + Drizzle/SQLite (matching ~/project-claude conventions), SSE-based
realtime updates, admin dashboard with status columns, ticket thread view,
Telegram long-polling integration (inbound + outbound), token-based customer
portal, Docker Compose packaging.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QcXH24ky6zjk2UyK5oZUPH

.env.example

@@ -0,0 +1,16 @@
+# Copy to .env and fill in — never commit the real .env.
+
+# AES-256-GCM key that encrypts channel credentials (Telegram token, and
+# later IMAP/SMTP) at rest in the database. Generate with:
+#   npm run generate-key
+CREDENTIALS_ENCRYPTION_KEY=
+
+# Initial admin account, created on first start if it doesn't exist yet.
+ADMIN_BOOTSTRAP_EMAIL=admin@top-sysops.ru
+ADMIN_BOOTSTRAP_PASSWORD=
+ADMIN_BOOTSTRAP_NAME=Admin
+
+# Optional: seeds the Telegram channel on first start (only if no bot has
+# been configured yet via the admin UI — Settings → Telegram always wins
+# afterwards). Get this from @BotFather.
+TELEGRAM_BOT_TOKEN=