fix(trader): restore TP/SL after partial_close to prevent unprotected positions

## Problem
- User reported: After partial_close, remaining position has NO TP/SL protection
- Root cause: Binance automatically cancels TP/SL orders when position size changes
- Impact: Remaining position exposed to unlimited risk (爆仓风险)

## Why TP/SL disappears
```
Opening:
  Position: 0.130 BTC
  TP order: 0.130 BTC ✓
  SL order: 0.130 BTC ✓

After 50% partial_close:
  Position: 0.065 BTC (remaining)
  TP order: 0.130 BTC ❌ Quantity mismatch → Binance cancels
  SL order: 0.130 BTC ❌ Quantity mismatch → Binance cancels
  → Remaining position has NO protection
```

## Solution

### Code changes (trader/auto_trader.go:1278-1305)

After partial_close execution, restore TP/SL with new quantity:

```go
// If AI provides new TP/SL prices
if decision.NewStopLoss > 0 || decision.NewTakeProfit > 0 {
    // Re-set SL with remaining quantity
    at.trader.SetStopLoss(symbol, side, remainingQuantity, newStopLoss)
    // Re-set TP with remaining quantity
    at.trader.SetTakeProfit(symbol, side, remainingQuantity, newTakeProfit)
} else {
    // WARNING: Remaining position has NO protection
    log.Printf("⚠️⚠️⚠️ 警告: 剩余仓位无止盈止损保护")
}
```

### Prompt updates

**Updated files**:
- prompts/adaptive.txt (line 171)
- prompts/default.txt (line 190)
- prompts/nof1.txt (line 334)

**Key change**: Emphasize AI MUST provide `new_stop_loss` and `new_take_profit` in `partial_close` decisions:

```markdown
- **partial_close**: Fill `close_percentage` (1-100),
  **STRONGLY RECOMMEND** providing `new_stop_loss` AND `new_take_profit`
  to protect remaining position (otherwise NO stop protection)
```

## Benefits

- ✅ Risk control: Remaining position protected after partial_close
- ✅ Clear warning: Logs explicit warning if AI doesn't provide new TP/SL
- ✅ AI guidance: Updated prompts emphasize importance of new TP/SL
- ✅ Backwards compatible: Works even if AI doesn't provide (just warns)

## Testing checklist

- [ ] Partial_close with new_stop_loss & new_take_profit → TP/SL restored
- [ ] Check Binance UI shows TP/SL orders after partial_close
- [ ] Partial_close without new TP/SL → Warning logged
- [ ] Remaining quantity matches TP/SL order quantity

Related: partial-close-tpsl-bug.md

decision/engine.go

@@ -675,8 +675,8 @@ func validateDecision(d *Decision, accountEquity float64, btcEthLeverage, altcoi
 
 		// ✅ 验证最小开仓金额（防止数量格式化为 0 的错误）
 		// Binance 最小名义价值 10 USDT + 安全边际
-		const minPositionSizeGeneral = 12.0   // 10 + 20% 安全边际
-		const minPositionSizeBTCETH = 60.0    // BTC/ETH 因价格高和精度限制需要更大金额（更灵活）
+		const minPositionSizeGeneral = 12.0 // 10 + 20% 安全边际
+		const minPositionSizeBTCETH = 60.0  // BTC/ETH 因价格高和精度限制需要更大金额（更灵活）
 
 		if d.Symbol == "BTCUSDT" || d.Symbol == "ETHUSDT" {
 			if d.PositionSizeUSD < minPositionSizeBTCETH {

prompts/adaptive.txt

@@ -168,7 +168,7 @@
 | `close_short`| 平掉空仓 | `reasoning` |
 | `update_stop_loss` | 调整止损 | `new_stop_loss`、`reasoning` |
 | `update_take_profit` | 调整止盈 | `new_take_profit`、`reasoning` |
-| `partial_close` | 部分平仓（1-100%） | `close_percentage`、`reasoning` |
+| `partial_close` | 部分平仓（1-100%） | `close_percentage`、`reasoning`、**强烈建议** `new_stop_loss` + `new_take_profit` 保护剩余仓位 |
 | `hold`       | 维持持仓 | `reasoning` |
 | `wait`       | 观望     | `reasoning` |
 

prompts/default.txt

@@ -187,7 +187,7 @@ THINK: trend=down, 等待确认
 - **开仓** (`open_long/open_short`)：必须填写 `position_size_usd`、`leverage`、`stop_loss`、`take_profit`、`risk_usd`；`reasoning` 写出信号与风险回报。
 - **平仓** (`close_long/close_short`)：`reasoning` 说明平仓原因（达到目标、触发失效条件等）。
 - **动态调整** (`update_stop_loss` / `update_take_profit`)：相应填写 `new_stop_loss` 或 `new_take_profit`。
-- **部分平仓** (`partial_close`)：需填写 `close_percentage`（1-100），说明目的（如锁定利润）。
+- **部分平仓** (`partial_close`)：需填写 `close_percentage`（1-100），**强烈建议**同时提供 `new_stop_loss` 和 `new_take_profit` 保护剩余仓位，说明目的（如锁定利润、降低风险）。
 - **观望或持有** (`wait/hold`)：`reasoning` 必须说明观望或继续持有的原因（例如信号不足、冷却中、趋势未变）。
 
 ### 仓位大小计算

prompts/nof1.txt

@@ -331,7 +331,7 @@ Every decision must follow this structure:
 ### Required field rules
 - **open_long / open_short**: Fill all numeric fields; `risk_usd` ≤ account_value × 0.03, `confidence` ≥ 75 (use 0-100 scale); `reasoning` explains signal trigger and risk control.
 - **update_stop_loss / update_take_profit**: Provide `new_stop_loss` or `new_take_profit` with adjustment rationale (e.g., trailing stop, locking profits).
-- **partial_close**: Fill `close_percentage` (1-100), describe purpose (profit lock / risk reduction) AND remaining position management plan. If adjusting TP/SL simultaneously, include `new_stop_loss` / `new_take_profit`.
+- **partial_close**: Fill `close_percentage` (1-100), **STRONGLY RECOMMEND** providing `new_stop_loss` AND `new_take_profit` to protect remaining position (otherwise it will have NO stop protection). Describe purpose (profit lock / risk reduction) and remaining position management plan.
 - **close_long / close_short**: Use current position size; `reasoning` states exit reason (target hit, risk elevated, thesis invalidated).
 - **hold / wait**: `reasoning` must explain why continuing to hold or waiting (e.g., trend intact, cooling period, insufficient signal).
 

trader/auto_trader.go

@@ -1275,6 +1275,35 @@ func (at *AutoTrader) executePartialCloseWithRecord(decision *decision.Decision,
 	log.Printf("  ✓ 部分平仓成功: 平仓 %.4f (%.1f%%), 剩余 %.4f",
 		closeQuantity, decision.ClosePercentage, remainingQuantity)
 
+	// 🔧 FIX: 部分平仓后重新设置止盈止损（基于剩余数量）
+	// 币安会自动取消原来的止盈止损订单（因为数量不匹配），所以必须重新设置
+	if decision.NewStopLoss > 0 || decision.NewTakeProfit > 0 {
+		log.Printf("  🎯 更新剩余仓位的止盈止损...")
+
+		// 设置新止损（基于剩余数量）
+		if decision.NewStopLoss > 0 {
+			if err := at.trader.SetStopLoss(decision.Symbol, positionSide, remainingQuantity, decision.NewStopLoss); err != nil {
+				log.Printf("  ⚠️ 设置新止损失败: %v", err)
+			} else {
+				log.Printf("  ✓ 已设置新止损: %.4f (数量: %.4f)", decision.NewStopLoss, remainingQuantity)
+			}
+		}
+
+		// 设置新止盈（基于剩余数量）
+		if decision.NewTakeProfit > 0 {
+			if err := at.trader.SetTakeProfit(decision.Symbol, positionSide, remainingQuantity, decision.NewTakeProfit); err != nil {
+				log.Printf("  ⚠️ 设置新止盈失败: %v", err)
+			} else {
+				log.Printf("  ✓ 已设置新止盈: %.4f (数量: %.4f)", decision.NewTakeProfit, remainingQuantity)
+			}
+		}
+	} else {
+		// ⚠️ AI 没有提供新的止盈止损，剩余仓位将失去保护
+		log.Printf("  ⚠️⚠️⚠️ 警告: 部分平仓后AI未提供新的止盈止损价格")
+		log.Printf("  → 剩余仓位 %.4f (价值 %.2f USDT) 目前没有止盈止损保护", remainingQuantity, remainingValue)
+		log.Printf("  → 建议: 在 partial_close 决策中包含 new_stop_loss 和 new_take_profit 字段")
+	}
+
 	return nil
 }
 
@@ -1594,8 +1623,8 @@ func normalizeSymbol(symbol string) string {
 // extractNewsSymbols 提取需要收集新闻的币种（持仓 + 候选币前几个 + BTC）
 func (at *AutoTrader) extractNewsSymbols(positions []decision.PositionInfo, candidates []decision.CandidateCoin) []string {
 	const (
-		maxNewsSymbols         = 10 // 最多收集10个币种的新闻（避免请求过多）
-		maxCandidatesForNews   = 5  // 从候选币中取前5个
+		maxNewsSymbols       = 10 // 最多收集10个币种的新闻（避免请求过多）
+		maxCandidatesForNews = 5  // 从候选币中取前5个
 	)
 
 	symbolSet := make(map[string]bool)