Fix Telegram Bot code quality issues - fixes #249

[zzjpython]

Description

This PR fixes the code quality issues identified in the bounty review for issue #249.

Changes Made:

1. Removed duplicate file: Deleted tools/telegram_bot/bot.py which was a duplicate of telegram_bot.py.
2. Implemented real /price command: Integrated DexScreener API to fetch real-time wRTC price data from Raydium, with Jupiter API fallback.
3. Added environment variable support: Created .env.example file and added python-dotenv dependency for easy configuration.
4. Improved error handling: Enhanced exception handling and logging throughout the codebase.
5. Updated documentation: Comprehensive README.md with setup instructions, Docker deployment, and feature list.
6. Fixed hardcoded values: Made API URL configurable via environment variable.

Testing:

• Price command now fetches real data from DexScreener API
• All other commands (miners, epoch, balance, health) remain functional
• Environment variable configuration tested
• Requirements updated with necessary dependencies

Deployment:

# 1. Set up environment
cp .env.example .env
# Edit .env with your TELEGRAM_BOT_TOKEN

# 2. Install dependencies
pip install -r requirements.txt

# 3. Run bot
python telegram_bot.py

This addresses the owner feedback regarding:

• Duplicate files
• /price placeholder (now real API integration)
• Hardcoded values
• Code quality improvements

Ready for review and merge. This should qualify for the remaining 10 RTC bounty payment.

Resolves: #249

[Scottcjn]

Payment confirmed — 10 RTC sent to wallet zzjpython for Telegram bot code quality fixes (duplicate removal, real DexScreener price integration, improved error handling).

Pending ID: 431, confirms in 24h.

This brings your total payout for the Telegram bot work to 25 RTC (15 RTC for PR #385 + 10 RTC for PR #387).