fix(playbook+flywheel): 修復 PlaybookSource enum + repair_steps 相容 + KM stats raw SQL

修復三個串聯 bug，讓 Playbook seed 能正常執行：

1. PlaybookSource 新增 YAML_RULE enum（alert_rules.yaml 匯入專用）
2. playbook_seed_service: source=YAML_RULE，dedup 改用 raw SQL by name，
   不再呼叫 list_playbooks（舊格式 repair_steps 會 validation error）
3. playbook_repository._orm_to_pydantic: 舊格式 repair_steps 補齊
   step_number/action_type 必填欄位（向下相容）
4. flywheel_stats_service: embedding IS NULL 改用 raw SQL，
   修復 KnowledgeEntryRecord ORM 無 embedding 屬性的 AttributeError

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

apps/api/src/services/flywheel_stats_service.py

@@ -225,8 +225,10 @@ class FlywheelStatsService:
 
             async with get_db_context() as db:
                 # 未向量化數量 (embedding IS NULL = 未向量化)
+                # 2026-04-15 ogt: KnowledgeEntryRecord ORM 不宣告 embedding 欄位（pgvector），
+                #                  改用 raw SQL 避免 AttributeError
                 unvectorized_q = await db.execute(
-                    select(func.count()).where(KnowledgeEntryRecord.embedding.is_(None))
+                    text("SELECT COUNT(*) FROM knowledge_entries WHERE embedding IS NULL")
                 )
                 unvectorized = unvectorized_q.scalar_one_or_none() or 0
 

apps/api/src/services/playbook_seed_service.py

@@ -42,15 +42,22 @@ async def seed_playbooks_from_rules() -> None:
 
         repo = get_playbook_repository()
 
-        # 取得現有 playbook source_ids，避免重複建立
-        existing, _ = await repo.list_playbooks(status=PlaybookStatus.APPROVED, limit=500)
-        existing_sources = {p.source for p in existing if p.source}
+        # 取得現有 YAML_RULE playbook，依 name 去重避免重複建立
+        # 2026-04-15 ogt: 不再用 list_playbooks（舊格式 repair_steps 會 validation error）
+        #                  改用 raw SQL 只撈 name 欄位，更穩健
+        from src.db.session import get_db_context
+        from sqlalchemy import text as sa_text
+        async with get_db_context() as db:
+            rows = await db.execute(
+                sa_text("SELECT name FROM playbooks WHERE source = 'yaml_rule'")
+            )
+            existing_names = {r[0] for r in rows.fetchall()}
 
         seeded = 0
         for rule in rules:
             rule_id = rule.get("id", "")
-            source_key = f"alert_rule:{rule_id}"
-            if source_key in existing_sources:
+            rule_name = rule.get("description", rule_id)
+            if rule_name in existing_names:
                 continue
 
             resp = rule.get("response", {})
@@ -71,7 +78,7 @@ async def seed_playbooks_from_rules() -> None:
                 name=rule.get("description", rule_id),
                 description=resp.get("description", rule.get("description", "")),
                 status=PlaybookStatus.APPROVED,
-                source=source_key,
+                source=PlaybookSource.YAML_RULE,
                 symptom_pattern=SymptomPattern(
                     alert_names=alertnames,
                     affected_services=[],