fix(content): make links configurable, register commands, enhance /id

• about.lua: use BOT_ADMINS[1] for owner ID instead of hardcoded value
• help.lua: read CHANNEL_URL, SUPPORT_URL, GITHUB_URL, DEV_URL from config with current values as defaults
• main.lua: register bot command menu on startup via set_my_commands, with separate admin-scoped command list for group administrators
• id.lua: add premium status, profile photo count, bot flag, forum status, linked chat, hidden members, and anti-spam fields
• .env.example: add new optional config keys for bot links