Massive code trim: 729 lines total (35% reduction)

- bot.py: 312 lines (merged PriceBot/PriceGroup/ChartGroup logic)
- database.py: 154 lines (consolidated SQL, inline maintenance)
- price_service.py: 82 lines (removed dead code, simplified)
- chart_service: 181 lines (unchanged - matplotlib required)

Removed: unused functions, duplicate logic, verbose patterns

Author: buzzkillb