fix(api): service_registry 安全降級 — Docker 無 YAML 時不 crash，fallback AUTO

apps/api/src/services/service_registry.py

@@ -16,24 +16,23 @@ import yaml
 
 logger = structlog.get_logger(__name__)
 
-# YAML 路徑 — 安全搜尋，相容本地開發 + Docker 容器
-# 本地: apps/api/src/services/ → parents[4] = repo root
-# Docker: /app/src/services/ → parents[3] = /app → 需要往上找 ops/config
-def _find_registry_path() -> Path:
-    """安全搜尋 service-registry.yaml，相容不同部署環境"""
-    candidates = [
-        Path(__file__).resolve().parents[4] / "ops" / "config" / "service-registry.yaml",  # 本地開發
-        Path(__file__).resolve().parents[3] / "ops" / "config" / "service-registry.yaml",  # Docker
-        Path("/app/ops/config/service-registry.yaml"),                                       # Docker 絕對路徑
-        Path(__file__).resolve().parents[2] / "ops" / "config" / "service-registry.yaml",
-    ]
-    for p in candidates:
-        if p.exists():
-            return p
-    # fallback: 回傳第一個候選（會在載入時報錯，但不會 crash import）
-    return candidates[0]
+# YAML 路徑 — 延遲載入，import 時不 crash
+# Docker 容器不包含 ops/ 目錄，所以 registry 在 K8s 環境中不可用
+# 功能降級: 找不到 YAML 時 get_service_registry() 回傳空 registry
+_DEFAULT_REGISTRY_PATH: Path | None = None
 
-_DEFAULT_REGISTRY_PATH = _find_registry_path()
+def _find_registry_path() -> Path | None:
+    """安全搜尋 service-registry.yaml，找不到回傳 None"""
+    current = Path(__file__).resolve().parent
+    for _ in range(10):
+        for subdir in ["ops/config", "ops/monitoring"]:
+            candidate = current / subdir / "service-registry.yaml"
+            if candidate.exists():
+                return candidate
+        if current == current.parent:
+            break
+        current = current.parent
+    return None
 
 
 class StatefulLevel(str, Enum):
@@ -64,7 +63,7 @@ class ServiceRegistryClient:
     """
 
     def __init__(self, registry_path: Path | None = None) -> None:
-        self._path = registry_path or _DEFAULT_REGISTRY_PATH
+        self._path = registry_path or _find_registry_path()
         self._services: dict[str, ServiceInfo] = {}
         self._backup_policies: dict[str, Any] = {}
         self._multisig_config: dict[str, Any] = {}
@@ -73,6 +72,10 @@ class ServiceRegistryClient:
     def _load(self) -> None:
         if self._loaded:
             return
+        if self._path is None or not self._path.exists():
+            logger.warning("service_registry_not_found", path=str(self._path), fallback="all services treated as AUTO")
+            self._loaded = True
+            return
         try:
             with open(self._path) as f:
                 data = yaml.safe_load(f)