feat: Add Phase 4 advanced metrics and components

- Add advanced metrics dashboard with trade analytics
- Add new trading components (EntryTypeAnalysis, MultiDayPositionTracker, NewsEventTracker, etc.)
- Add strategy mode selector and trend confirmation
- Add risk automation panel and slippage correlation analysis
- Add daily trading plan enhancements with modal components
- Add custom hooks (useApi, useLocalStorage, useAdvancedTradeMetrics)
- Add broker service integration and trading API
- Add test setup and vitest configuration
- Include parquet data files for live market data
- Add comprehensive documentation in docs/ folder

backend/app/streaming/data_provider.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from app.config import settings
+from app.streaming.local_feed import local_feed
+from app.streaming.metatrader_feed import metatrader_feed
+from app.streaming.csv_feed import csv_feed
+from app.streaming.historical_replay import historical_replay
+
+
+# Registry for future providers. For now only the local simulator is available.
+_PROVIDER_REGISTRY = {
+    "historical_replay": historical_replay,
+    "local_simulator": local_feed,
+    "metatrader": metatrader_feed,
+    "csv_replay": csv_feed,
+}
+
+provider_key = settings.DATA_PROVIDER.lower().strip()
+data_provider = _PROVIDER_REGISTRY.get(provider_key)
+
+if data_provider is None:
+    raise ValueError(
+        f"Unsupported DATA_PROVIDER '{settings.DATA_PROVIDER}'. Available: {', '.join(_PROVIDER_REGISTRY)}"
+    )