merge: Sync with NoFxAiOS/dev - adopt WebSocket architecture

Merged 54 commits from upstream (NoFxAiOS/dev @ 8832557)

## Key Changes

### 🚀 WebSocket Real-time Data Architecture
- ✅ NEW: WebSocket client with auto-reconnect (websocket_client.go)
- ✅ NEW: Market data monitor with combined streams (monitor.go)
- ✅ NEW: K-line caching system (combined_streams.go)
- ✅ UPGRADE: market/data.go now uses WebSocket instead of REST API
- 🎯 Benefits: Lower latency, reduced API limits, auto-reconnect

### 📝 Documentation & CI/CD
- ✅ NEW: Comprehensive troubleshooting guides (EN + ZH-CN)
- ✅ UPGRADE: Enhanced PR workflow with checks
- ✅ NEW: PR title guide & template improvements
- ✅ UPDATE: FAQ expanded with common issues

### 🔧 Conflict Resolution
- market/data.go: Adopted upstream WebSocket version
- prompts/adaptive.txt: Kept our v5.5.6.1 (conf≥85, strict strategy)

### 📊 Stats
- Files changed: 40+
- New files: 12 (WebSocket modules, docs, CI)
- Commits merged: 54

Related: feature/partial-close-dynamic-tpsl
Upstream: NoFxAiOS/nofx @ 8832557

decision/engine.go

@@ -124,7 +124,7 @@ func GetFullDecisionWithCustomPrompt(ctx *Context, mcpClient *mcp.Client, custom
 	// 4. 解析AI响应
 	decision, err := parseFullDecisionResponse(aiResponse, ctx.Account.TotalEquity, ctx.BTCETHLeverage, ctx.AltcoinLeverage)
 	if err != nil {
-		return nil, fmt.Errorf("解析AI响应失败: %w", err)
+		return decision, fmt.Errorf("解析AI响应失败: %w", err)
 	}
 
 	decision.Timestamp = time.Now()
@@ -409,7 +409,7 @@ func parseFullDecisionResponse(aiResponse string, accountEquity float64, btcEthL
 		return &FullDecision{
 			CoTTrace:  cotTrace,
 			Decisions: []Decision{},
-		}, fmt.Errorf("提取决策失败: %w\n\n=== AI思维链分析 ===\n%s", err, cotTrace)
+		}, fmt.Errorf("提取决策失败: %w", err)
 	}
 
 	// 3. 验证决策
@@ -417,7 +417,7 @@ func parseFullDecisionResponse(aiResponse string, accountEquity float64, btcEthL
 		return &FullDecision{
 			CoTTrace:  cotTrace,
 			Decisions: decisions,
-		}, fmt.Errorf("决策验证失败: %w\n\n=== AI思维链分析 ===\n%s", err, cotTrace)
+		}, fmt.Errorf("决策验证失败: %w", err)
 	}
 
 	return &FullDecision{