feat(mcp-integrations): Phase S 架構修復 + MCP 整合基礎建設

Phase S 技術債修復 (首席架構師審查 82→完整):
- S-01: generate_alert_fingerprint 移至 AlertAnalyzer.generate_fingerprint() staticmethod
- S-04: 移除 Pydantic v2 deprecated json_encoders (直接用原生 datetime 序列化)

Sentry MCP 整合 (Phase 23):
- ADR-048: Sentry→OpenClaw AI Triage 架構決策
- sentry_webhook_service.py: parse/analyze/create_incident/build_message Service 層
- config.py: SENTRY_WEBHOOK_SECRET (Fail-Closed HMAC-SHA256)

Playwright MCP 整合 (短期):
- smoke.spec.ts: 5 頁面 E2E smoke test (home/dashboard/incidents/approvals/terminal)
- cd.yaml: E2E Smoke Test 步驟 + Telegram 🎭 Smoke 狀態通知

長期規劃 ADR:
- ADR-049: Figma Code Connect 設計系統同步
- ADR-050: Telegram 互動式 Incident 2.0 (6鍵 Inline Keyboard)
- ADR-051: Context7 依賴升級顧問 (Next.js 14→15, FastAPI 0.115→0.128)

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

apps/api/src/core/config.py

@@ -425,6 +425,15 @@ class Settings(BaseSettings):
         HttpUrl(v)
         return v
 
+    # ==========================================================================
+    # Phase 23 (ADR-048): Sentry Webhook → OpenClaw AI Triage
+    # Sentry Issue Alert Webhook 簽章驗證 (sentry-hook-signature header)
+    # ==========================================================================
+    SENTRY_WEBHOOK_SECRET: str = Field(
+        default="",
+        description="Sentry Webhook secret for HMAC-SHA256 signature verification",
+    )
+
     # ==========================================================================
     # Phase 13.1: GitHub Webhook → OpenClaw 整合
     # GitHub PR/Push 事件自動觸發 AI 代碼審查