REFACTOR(app): remove vault folder and apply jaejadle structure

- Remove vault folder (all secrets in externalsecret.yaml)
- Move serviceaccount to base
- Remove namespace.yaml (ArgoCD auto-creates)

deploy/k8s/overlays/prod/kustomization.yaml

@@ -17,5 +17,5 @@ commonLabels:
 # 이미지 태그 설정 (ArgoCD Image Updater가 자동으로 업데이트)
 images:
   - name: gitea0213.kro.kr/bluemayne/mas
-    newTag: main-sha-16e2dc2153719146680c0f8519e8350a31f2c843
+    newTag: main-sha-ea42d1b2e4dcaea223cf4dbdbc6eaa315ee1eeef
 

deploy/vault/mas-api-keys.yaml

@@ -1,24 +0,0 @@
-apiVersion: external-secrets.io/v1beta1
-kind: ExternalSecret
-metadata:
-  name: mas-api-keys
-  namespace: mas
-spec:
-  refreshInterval: 1h
-  secretStoreRef:
-    kind: ClusterSecretStore
-    name: vault-backend
-  target:
-    name: mas-api-keys
-    creationPolicy: Owner
-  data:
-    - secretKey: anthropic-api-key
-      remoteRef:
-        key: mas/api-keys
-        property: ANTHROPIC_API_KEY
-    - secretKey: groq-api-key
-      remoteRef:
-        key: mas/api-keys
-        property: GROQ_API_KEY
-        property: GROQ_API_KEY
-

deploy/vault/mas-postgres.yaml

@@ -1,23 +0,0 @@
-apiVersion: external-secrets.io/v1beta1
-kind: ExternalSecret
-metadata:
-  name: postgresql-password
-  namespace: mas
-spec:
-  refreshInterval: 1h
-  secretStoreRef:
-    kind: ClusterSecretStore
-    name: vault-backend
-  target:
-    name: postgresql-password
-    creationPolicy: Owner
-  data:
-    - secretKey: password
-      remoteRef:
-        key: databases/postgresql
-        property: PASSWORD
-    - secretKey: postgres-password
-      remoteRef:
-        key: databases/postgresql
-        property: POSTGRES_PASSWORD
-

deploy/vault/postgresql-root-password.yaml

@@ -1,19 +0,0 @@
-apiVersion: external-secrets.io/v1beta1
-kind: ExternalSecret
-metadata:
-  name: postgresql-root-password
-  namespace: mas
-spec:
-  refreshInterval: 1h
-  secretStoreRef:
-    kind: ClusterSecretStore
-    name: vault-backend
-  target:
-    name: postgresql-root-password
-    creationPolicy: Owner
-  data:
-    - secretKey: password
-      remoteRef:
-        key: databases/postgresql
-        property: PASSWORD
-