fix(drift): dedupe blocked auto-adopt escalations

apps/api/src/services/drift_adopt_service.py

@@ -277,6 +277,12 @@ class DriftAdoptService:
 
                 # Step 3: 找出受影響的 YAML 檔並 commit 更新
                 committed_files = await self._commit_drift_yaml(client, headers, branch_name, report)
+                if not committed_files:
+                    return {
+                        "success": False,
+                        "message": "無直接匹配的 YAML 檔，未建立零 diff 承認 PR",
+                        "pr_url": None,
+                    }
 
                 # Step 4: 建立 PR
                 pr_url = await self._create_pr(
@@ -292,7 +298,7 @@ class DriftAdoptService:
                 logger.info("drift_adopt_pr_created", report_id=report.report_id, pr_url=pr_url)
                 return {
                     "success": True,
-                    "message": f"PR 已建立，請 SRE review 後 merge",
+                    "message": "PR 已建立，請 SRE review 後 merge",
                     "pr_url": pr_url,
                 }
 
@@ -345,7 +351,9 @@ class DriftAdoptService:
             if not item.is_allowlisted
         }
 
-        for yaml_file in sorted(self._k8s_dir.glob("*.yaml")):
+        for yaml_file in sorted(self._k8s_dir.rglob("*.yaml")):
+            if not yaml_file.is_file():
+                continue
             # 判斷此 YAML 是否與漂移相關
             file_stem = yaml_file.stem.lower()
             if not any(kind in file_stem for kind in affected_kinds):