tgclient: регистрация me_router в main.py

tgclient: backend M1-M5 — FastAPI + Telethon + MCP (core, media, voice/rounds, login-тулы) ...

- каркас: config/db/schema/security/auth/locales/errors/synapse_report
- Telethon: AccountManager (StringSession+persist), login_flow (общий SPA/MCP), waveform 63x5 бит, rate-limit мутаций
- MCP: FastMCP stateless+json, гард require_mcp (mcp_*/admin-токен/cookie), ContextVar личности, 22 тула
- API: gnexus-auth SSO + вебхуки, mcp_tokens (plaintext-once), accounts, admin
- деплой: Dockerfile (multi-stage SPA), docker-compose, README