feat(api): AIOps KPI Dashboard — AI 自主化成熟度全景 (積木化重構)

GET /api/v1/aiops/kpi → 一次整合 MASTER §7.1 全部 KPI.

leWOOOgo 積木化鐵律對齊:
  - Router (api/v1/aiops_kpi.py) 僅 HTTP 路由, 不碰 DB
  - Service (services/aiops_kpi_service.py) 負責所有 SQL + 計算
  - 前次 commit 被 hook 擋下 (Router 直接 import get_db_context), 本次修正

services/aiops_kpi_service.py (~230 行):
  AiopsKpiService.get_snapshot() 回 6 section:

  1. asset_inventory: by_type + total + last_scan (run_id/ended_at/總計/new/modified)
  2. coverage_kpi: 7 維 × (green/yellow/red/unknown)
     + green_ratio_per_dim + overall_green_ratio (MASTER §7.1 #5 SLO)
  3. rule_quality: total/with_fires/noisy/deprecated/ai_generated + top 5 noisy
  4. capacity_health: 最新 snapshot per host + by_verdict + violations_7d
  5. automation_flow_24h: aol detail + by_actor + by_operation_type
  6. ai_autonomy_score: 0-100 總分
     5 子項 × 20: asset_coverage / rule_quality / capacity_health /
                  automation_flow / ai_diversity
     grade: mature(90+) / in_progress(70-90) / starter(50-70) / initial(<50)

api/v1/aiops_kpi.py (~35 行 精簡 router):
  只做 router = APIRouter() + @router.get 委派給 service

main.py:
  include_router(aiops_kpi_v1.router, prefix='/api/v1', tags=['AIOps KPI'])

統帥使用:
  curl http://192.168.0.121:32334/api/v1/aiops/kpi | jq .
  一次看見 AI 自主化成熟度全景

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/main.py

@@ -35,6 +35,7 @@ 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 aiops_kpi as aiops_kpi_v1  # ADR-090 § Phase 7 KPI Dashboard
 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
@@ -685,6 +686,7 @@ 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(aiops_kpi_v1.router, prefix="/api/v1", tags=["AIOps KPI"])  # ADR-090 § Phase 7 Dashboard
 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"])