fix: resolve all remaining TODOs, add dev mode auth bypass

- Learning engine: expand default weights from 3 to all 9 strategies
- Learning engine: resolve placeholder strategy_id with DB lookup
- Learning engine: pass strategy_sources from trade execution
- Trade executor: respect trading:paused Redis flag in RiskManager
- Portfolio sync: compute actual daily P&L from day-start snapshot
- Portfolio API: cumulative P&L from first snapshot, read pause flag
- Portfolio metrics: compute max drawdown and avg hold duration
- Add strategy_sources field to TradeExecution schema
- Add dev_mode config (TRADING_DEV_MODE) to bypass auth for local dev
- Dashboard: VITE_DEV_MODE bypasses ProtectedRoute and 401 redirects
- Vite proxy target configurable via VITE_API_TARGET
- Add top-level README.md and remaining-work-plan.md
- Update CLAUDE.md with correct counts and remove stale TODOs
- 404 tests passing

Made-with: Cursor

shared/schemas/trading.py

@@ -118,6 +118,7 @@ class TradeExecution(BaseModel):
     status: OrderStatus
     signal_id: UUID | None = None
     strategy_id: UUID | None = None
+    strategy_sources: list[str] = Field(default_factory=list)
     timestamp: datetime
 
     model_config = {"from_attributes": True}