fix: 4 cycle errors — NameError _log, WHEAT/EUR/USD ticker normalization, 429 serial scoring

- auto_cycle.py: replace _log with logger (NameError at lines 484/489)
- auto_cycle.py: normalize underlying via _normalize_ticker before _resolve_ticker
  so WHEAT→ZW=F→WEAT and EUR/USD→EURUSD=X→FXE reach the IV watchlist correctly
- iv_engine.py: _resolve_ticker now strips slash-format forex (EUR/USD→EURUSD=X)
  before _PROXY lookup, fixing yfinance 500/404 spam from get_atm_iv
- database.py: _fetch in log_trade_entries uses _normalize_ticker (not _normalize_yf_ticker)
  so commodity aliases like WHEAT→ZW=F are applied at price-fetch time
- ai_analyzer.py: max_workers=1 for batch scorer — parallel workers both slept and
  retried simultaneously after 429, causing repeated bursts; sequential fixes the pattern
- journal.py + JournalDeBord.tsx: add price_warning field (no_price_data/no_entry_price/
  no_live_price) with visible ⚠ badge and amber color on affected ticker/price cells

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/journal.py

@@ -87,10 +87,19 @@ def trade_mtm(days: int = 30):
             elif pnl_pct <= stop:
                 alert_type = "stop_loss"
 
+        price_warning = None
+        if entry_price is None and current_price is None:
+            price_warning = "no_price_data"
+        elif entry_price is None:
+            price_warning = "no_entry_price"
+        elif current_price is None:
+            price_warning = "no_live_price"
+
         result.append({
             **e,
             "current_price": current_price,
             "pnl_pct": pnl_pct,
+            "price_warning": price_warning,
             "days_held": days_held,
             "direction": "bearish" if _is_bearish(e.get("strategy", "")) else "bullish",
             "maturity": maturity,