feat: add Telegram bot for watch alerts with /check and /watch commands (Fixes #26)

[lb1192176991-lab]

What

Adds a standalone Telegram bot (scripts/telegram_bot.py) that wraps solana-rug watch functionality. Users send mint addresses to the bot and get back safety reports. Optional monitoring pushes alerts when scores drop.

Why

Telegram is where the Solana degens live. A bot that answers "is this token safe?" in under 3 seconds is the highest-impact distribution channel.

Features

Commands

• /check <MINT> — Get formatted safety report (score, risk, factors, market data, warnings)
• /watch <MINT> — Start monitoring a token (persists in SQLite, same DB as CLI watch mode)
• /unwatch <MINT> — Stop monitoring
• /watches — List your watched tokens

Alerting

• Background thread checks all watched tokens every 5 minutes
• Alerts when score drops >= 10 points: "Score dropped: 85 → 60 (25 pts)"
• Shares SQLite database with CLI watch mode — mix CLI and Telegram monitoring

Infrastructure

• Rate limiting: max 1 check per 5 seconds per user
• Report formatting respects Telegram's 4096 char limit
• Markdown formatting for clean mobile rendering
• Dockerfile for easy deployment
• TELEGRAM_BOT_TOKEN env var (from @Botfather)

Test coverage

• Rate limiter: first request allowed, rapid repeat blocked, different users independent
• Report formatting: score/risk displayed correctly, market data parsed
• Watch DB: add/get/remove operations, persistence, primary key constraints
• Mocked tests — no real bot token needed

Example

/check DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263

*🛡️ BONK Safety Report*
Score: 100/100 — LOW
*Score Factors:*
  ✅ Mint: 0/10
  ✅ Liquidity: 0/10
  ✅ Holders: 0/10

Fixes: #26

[codegraphtheory]

Superseded by the merged PR #47. Same feature, re-applied on latest main. Thanks for contributing!