Implement AI predictor module (ai_predictor.py)

[bryanssss]

Implement the core AI predictor engine for price movement forecasting.

• Build LSTM and ensemble model logic (ai_predictor.py)
• Integrate technical indicators (RSI, MACD, Bollinger Bands)
• Enable model loading/training and prediction routines
• Add basic confidence scoring
• Write tests for prediction outputs

Acceptance Criteria:

• AI model produces predictions and confidence scores for sample historical data
• At least one simple unit test provided
• Document usage in the README