Pro tier upgrade: quant rearchitect + WebSocket level-breach monitor

- Restore XAU/USD (Pro plan), drop USD/CAD, raise rate limit to 55/min
- Reduce signal engine to 4 uncorrelated pillars (EMA, RSI, BB, Candlestick)
  with regime-adaptive weights (trending boosts EMA, ranging boosts RSI+BB)
- Add structure-based S/R (swing highs/lows) for trade setup targeting
- Fix confidence death spiral: all adjustments now additive, not multiplicative
- Dynamic R:R trade setup: SL behind swing level, TP at next structure level,
  reject if R:R < 1.5
- Fix news engine for all 4 pairs (was hardcoded to USDJPY)
- Add WebSocket monitor: streams live ticks, triggers M15 scan on level breach
  with 5-min cooldown per pair — catches breakouts between candle boundaries
- Add correlation filter (EUR/USD+GBP/USD, XAU/USD+USD/JPY exposure warnings)

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

data_provider.py

@@ -49,7 +49,7 @@ class ForexDataProvider:
         Timeframe.D1: 86400, Timeframe.W1: 604800,
     }
 
-    RATE_LIMIT = 8
+    RATE_LIMIT = 55
     RATE_WINDOW = 60.0
 
     def __init__(self, config: PlatformConfig):
@@ -67,6 +67,8 @@ class ForexDataProvider:
 
     @staticmethod
     def _to_td_symbol(symbol: str) -> str:
+        if "/" in symbol:
+            return symbol
         clean = symbol.replace("=X", "")
         return f"{clean[:3]}/{clean[3:]}"
 
@@ -132,7 +134,7 @@ class ForexDataProvider:
     # ── Private ────────────────────────────────────────────────────
 
     def _throttle(self, credits: int = 1) -> None:
-        """Free tier: 8 credits / minute. Block until budget allows."""
+        """Pro tier: 55 credits / minute. Block until budget allows."""
         while True:
             now = time.time()
             while self._request_times and now - self._request_times[0] >= self.RATE_WINDOW: