fix: Alloy block syntax, dpkg lock wait, hitl local bind, ai-reader nodes RBAC, harness image f30af2a

- Alloy 설정 3종: rule 블록을 한 줄 쉼표 나열에서 줄바꿈 속성으로 수정(실측: k8s DaemonSet
  CrashLoopBackOff, db-replica alloy.service "expected TERMINATOR, got ,"). alloy fmt로 3종 파싱 확인.
- vm/postgres-common/alloy.sh: apt에 DPkg::Lock::Timeout=600(db-primary에서 unattended-upgrades 잠금으로 100 종료).
- vm/ai-env/compose.yaml: hitl 8081을 127.0.0.1에만 바인딩(agent는 compose 네트워크로 접근).
- workloads/rbac/ai-reader.yaml: nodes get/list/watch ClusterRole 추가(agent get_k8s(nodes) selfcheck 거부 해소).
- vm/harness/image.tag: f30af2a(POST /proposals/{token}/approve·reject 포함 러너).

vm/postgres-common/config.alloy

@@ -15,7 +15,10 @@ prometheus.scrape "db" {
 
 prometheus.relabel "instance" {
   forward_to = [prometheus.remote_write.mimir.receiver]
-  rule { target_label = "instance", replacement = sys.env("INSTANCE") }
+  rule {
+    target_label = "instance"
+    replacement = sys.env("INSTANCE")
+  }
 }
 
 prometheus.remote_write "mimir" {