[SUBTASK-004] feat(ml): Integrate EnsemblePanel UI and add more symbols
- Integrate EnsemblePanel component in MLDashboard ensemble tab
- Add configuration UI for ensemble model weights and voting method
- Implement weighted ensemble prediction calculation
- Expand symbol list: EURUSD, GBPUSD, USDJPY, XAUUSD, BTCUSD, ETHUSD, USDCHF, AUDUSD
- Add ability to save/reset ensemble configuration to localStorage
- Show agreement count and signal validity in prediction summary
ST-004.1: Ensemble Models UI [8 SP] - COMPLETED
ST-004.2: More symbols support [5 SP] - COMPLETED
ST-004.3: WebSocket real-time - ALREADY IMPLEMENTED (mlSignalsWS exists)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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