feat(api): 新增 SRE 戰情室 digest preview

apps/api/src/services/report_generation_service.py

@@ -375,6 +375,54 @@ class ReportGenerationService:
         ]
         return "\n".join(lines)
 
+    def format_sre_digest_preview(
+        self,
+        source_health: dict[str, Any] | None,
+        *,
+        generated_at: datetime | None = None,
+    ) -> str:
+        """Format an AwoooI SRE war-room no-send digest preview."""
+        now = generated_at or now_taipei()
+        source_health = source_health or {}
+        rollups = source_health.get("rollups") or {}
+        ok_count = int(rollups.get("source_ok_count") or 0)
+        total_count = int(rollups.get("source_count") or 0)
+        gap_count = int(rollups.get("source_gap_count") or 0)
+        confidence = int(rollups.get("confidence_percent") or 0)
+        preview_count = int(rollups.get("no_send_preview_count") or 0)
+        work_items = source_health.get("work_items") or []
+        gap_ids = [
+            str(item.get("work_item_id"))
+            for item in work_items
+            if item.get("work_item_id")
+        ][:5]
+        gap_text = ", ".join(gap_ids) if gap_ids else "無"
+
+        lines = [
+            "<b>🛡️ AwoooI SRE 戰情室 digest no-send preview</b>",
+            f"<b>{now.strftime('%Y-%m-%d %H:%M')}</b> 台北時間",
+            "",
+            "<b>📡 資料源健康</b>",
+            f"  來源: <code>{ok_count}/{total_count}</code> | 缺口: {gap_count} | 信心: <b>{confidence}%</b>",
+            f"  工作項: {html.escape(gap_text)}",
+            "",
+            "<b>🗓️ 日 / 週 / 月報狀態</b>",
+            f"  no-send preview: {preview_count} 份",
+            "  live Telegram send: 0",
+            "  Gateway queue write: 0",
+        ]
+        lines.extend(self._format_report_source_health_block(source_health))
+        lines += [
+            "",
+            "<b>🧭 下一步</b>",
+            "  1. 補齊 report-source-gap 專屬 PlayBook 與 Verifier readback。",
+            "  2. Owner review 後才允許 SRE digest 實發批准包。",
+            "  3. 任何中低風險自動處理仍需 rollback / post-check / audit receipt。",
+            "",
+            "<i>只讀草案：不發 Telegram、不寫 Gateway queue、不改排程、不啟動 runtime gate。</i>",
+        ]
+        return "\n".join(lines)
+
     def format_daily_report(
         self,
         kpi: DailyKpi,