feat(market_scanner, strategy): 引入回退信号逻辑以优化信号处理

在市场扫描和交易策略中增加了回退信号逻辑，当信号强度为零且方向未明确时，采用RSI、MACD和布林带的综合信号进行判断，避免长期无推荐。这一改动旨在提升策略的灵活性与可用性，确保在市场波动时仍能提供有效的交易建议。

trading_system/market_scanner.py

@@ -854,6 +854,38 @@ class MarketScanner:
             # 强度上限归一到 0-10
             signal_strength = max(0, min(int(signal_strength), 10))
 
+            # 回退：趋势逻辑过严时（MACD/EMA/4H 未同时满足），用 RSI/MACD/布林 综合得分给弱信号，避免长期全 0
+            if signal_strength == 0 and direction is None and signal_score >= 5:
+                fallback_strength = min(5, max(1, signal_score - 3))  # 5->2, 6->3, 7->4, 8+->5
+                if rsi is not None:
+                    if rsi < 35:
+                        direction = 'BUY'
+                        signal_strength = fallback_strength
+                    elif rsi > 65:
+                        direction = 'SELL'
+                        signal_strength = fallback_strength
+                if direction is None and bollinger:
+                    if current_price <= bollinger.get('lower', float('inf')):
+                        direction = 'BUY'
+                        signal_strength = fallback_strength
+                    elif current_price >= bollinger.get('upper', -float('inf')):
+                        direction = 'SELL'
+                        signal_strength = fallback_strength
+                if direction is None and macd and macd.get('histogram') is not None:
+                    if macd['histogram'] > 0 and macd.get('macd', 0) > macd.get('signal', 0):
+                        direction = 'BUY'
+                        signal_strength = fallback_strength
+                    elif macd['histogram'] < 0 and macd.get('macd', 0) < macd.get('signal', 0):
+                        direction = 'SELL'
+                        signal_strength = fallback_strength
+                if direction is None and ema20 and ema50:
+                    if current_price > ema20 > ema50:
+                        direction = 'BUY'
+                        signal_strength = fallback_strength
+                    elif current_price < ema20 < ema50:
+                        direction = 'SELL'
+                        signal_strength = fallback_strength
+
             # ===== 趋势状态缓存（用于后续“入场时机过滤”）=====
             try:
                 # 只有在方向明确且信号强度达到最小门槛时，才记录趋势状态

trading_system/strategy.py

@@ -680,6 +680,18 @@ class TradingStrategy:
             signal_strength = max(0, min(int(signal_strength), 10))
         except Exception:
             pass
+        # 回退：趋势逻辑过严导致 0 时，采用扫描器回退信号（RSI/MACD/布林综合），避免长期无推荐
+        if signal_strength == 0 and direction is None:
+            scan_strength = symbol_info.get('signal_strength', 0)
+            scan_dir = symbol_info.get('direction')
+            try:
+                scan_strength = int(scan_strength) if scan_strength is not None else 0
+            except (TypeError, ValueError):
+                scan_strength = 0
+            if scan_strength >= 1 and scan_dir in ('BUY', 'SELL'):
+                signal_strength = min(scan_strength, 5)
+                direction = scan_dir
+                reasons.append("采用扫描器综合信号(弱)")
         should_trade = signal_strength >= min_signal_strength and direction is not None
 
         # ===== RSI / 24h 涨跌幅过滤：做多不追高、做空不杀跌；可选 RSI 极端反向（超买反空/超卖反多）=====