feat: /qe-fleet run 安徽运八需求 + 系统坑修复

系统修复:
- fleet_runner.py: Windows UTF-8 编码兼容（reconfigure stdout/stderr）
- fleet_runner.py: run 命令自动生成合并清单供导出使用
- fleet_manifest.py: 新增 save_merged_manifest() 保存统一清单
- fleet_config.yml: 修复 YAML keywords 格式（block sequence → flow sequence）
- 恢复被误删的知识库文件(payment_flow_cases, marketing_activity_cases)

QE Fleet 产物 (安徽运八需求):
- 153个测试点 + 53条可执行测试用例
- 需求分析/风险评估/测试策略/质量裁决（PASS）
- Excel 导出 + 版本快照 v2
- 确认结论文件已归档

output/manifests/安徽运八需求_analyze.json

@@ -0,0 +1,73 @@
+{
+  "base_name": "安徽运八需求",
+  "analysis_file": "E:\\test\\QaAutomationHub\\output\\analysis\\安徽运八需求_分析.md",
+  "relation_report_file": "E:\\test\\QaAutomationHub\\output\\analysis\\安徽运八需求_关联与冲突.md",
+  "risk_report_file": "E:\\test\\QaAutomationHub\\output\\analysis\\安徽运八需求_风险评估.md",
+  "related_requirements": [
+    {
+      "path": "E:\\test\\QaAutomationHub\\source_docs\\requirements_raw\\网货企业端接口文档（最新）.pdf",
+      "similarity": 0.069578
+    }
+  ],
+  "conflict_candidates_count": 0,
+  "conflict_summary": {},
+  "risk_matrix": {
+    "risks": [
+      {
+        "id": "RISK-FINANCIAL",
+        "category": "资损",
+        "keywords_matched": [
+          "金额",
+          "支付"
+        ],
+        "likelihood": 2,
+        "impact": 5,
+        "score": 10,
+        "level": "P1",
+        "conflict_amplified": false
+      },
+      {
+        "id": "RISK-AVAILABILITY",
+        "category": "可用性",
+        "keywords_matched": [
+          "超时",
+          "重试"
+        ],
+        "likelihood": 2,
+        "impact": 4,
+        "score": 8,
+        "level": "P2",
+        "conflict_amplified": false
+      }
+    ],
+    "total": 2,
+    "p0_count": 0,
+    "p1_count": 1
+  },
+  "confirmation_gate": {
+    "required": true,
+    "reasons": [
+      "识别到 1 个历史相似需求，需确认与旧需求的关系类型、生效范围和是否需要回写历史需求。"
+    ],
+    "pending_markers_count": 0,
+    "decision_file": "E:\\test\\QaAutomationHub\\decisions\\安徽运八需求_确认结论.md",
+    "decision_status": "confirmed",
+    "decision_status_label": "已确认",
+    "allow_export_before_confirmation": true,
+    "candidate_decision_files": [
+      "E:\\test\\QaAutomationHub\\decisions\\安徽运八需求_确认结论.md"
+    ],
+    "suggested_decision_file": "E:\\test\\QaAutomationHub\\decisions\\安徽运八需求_确认结论.md"
+  },
+  "agent_notes": {
+    "requirement-analyzer": "识别 1 个关联需求",
+    "conflict-detector": "检测到 0 个冲突候选",
+    "risk-assessor": "识别 2 个风险项"
+  },
+  "_meta": {
+    "zone": "analyze",
+    "base_name": "安徽运八需求",
+    "updated_at": "2026-07-13T01:33:01.554826+00:00",
+    "status": "completed"
+  }
+}