chore(bot): disable Televerse runtime path and remove tracked front/node_modules

[Dhereal1]

Summary

Follow-up cleanup after PR-55/56 merge:

1. Remove Televerse from active runtime path (for now), keeping the bot Vercel-only with grammY.
2. Remove tracked front/node_modules from git and guard with .gitignore.

Changes

Runtime simplification

• front/bot-service/grammy-bot.js
  • Removed Televerse forwarding from message:text handling.
  • Non-command text now follows local fallback behavior only.
• front/bot-service/config.js
  • Removed TELEVERSE_BASE_URL and TELEVERSE_INTERNAL_KEY runtime config fields.
• front/api/bot.js
  • Updated health payload to reflect forwarding disabled.
• Removed unused Televerse helper files:
  • front/bot-service/downstream.js
  • front/bot-service/router.js
• front/README.md
  • Removed Televerse runtime guidance for current mode.

Repo hygiene

• Removed tracked front/node_modules from repository.
• Added ignore protection:
  • .gitignore: node_modules/ and front/node_modules/

Notes

• This PR does not alter /start, /help, /ping command behavior semantics.
• This PR keeps grammY webhook handling on Vercel and reduces moving parts.