feat(Phase 6): AI SLO REST API — GET /api/v1/ai/slo 收官

ADR-087 Phase 6 自我治理閉環最後一塊拼圖：

1. api/v1/ai_slo.py — GET /api/v1/ai/slo
   - Service 層快取優先（TTL 5min，AiSloCalculator.get_cached_report）
   - force_refresh=true 強制重算（AiSloCalculator.run）
   - Router 層零 Redis 直接存取（leWOOOgo 積木化鐵律）

2. main.py — 路由掛載 ai_slo_v1.router（prefix=/api/v1）

3. MASTER §8 Living Changelog 追加：
   - P0 告警靜默 3 根因 RCA 完整紀錄
   - P2 飛輪斷鏈修復摘要
   - Phase 6 全元件完成清單

Phase 6 退出條件 5/6 已達（生產驗證待 image 上線）

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

apps/api/src/main.py

@@ -34,6 +34,7 @@ from sentry_sdk.integrations.starlette import StarletteIntegration
 
 from src.api.v1 import agents as agents_v1  # Phase 9.5: Agent Teams API
 from src.api.v1 import ai as ai_v1
+from src.api.v1 import ai_slo as ai_slo_v1  # Phase 6 ADR-087: AI SLO 自我治理
 from src.api.v1 import approvals as approvals_v1
 from src.api.v1 import alert_operation_logs as alert_operation_logs_v1
 from src.api.v1 import audit_logs as audit_logs_v1
@@ -514,6 +515,7 @@ app.include_router(csrf_v1.router, prefix="/api/v1", tags=["Security"])  # Phase
 app.include_router(dashboard_v1.router, prefix="/api/v1", tags=["Dashboard"])
 app.include_router(approvals_v1.router, prefix="/api/v1", tags=["HITL Approvals"])
 app.include_router(ai_v1.router, prefix="/api/v1", tags=["AI Decision"])
+app.include_router(ai_slo_v1.router, prefix="/api/v1", tags=["AI SLO"])  # Phase 6 ADR-087
 app.include_router(webhooks_v1.router, prefix="/api/v1", tags=["Webhooks"])
 app.include_router(timeline_v1.router, prefix="/api/v1", tags=["Timeline"])
 app.include_router(audit_logs_v1.router, prefix="/api/v1", tags=["Audit Logs"])