feat(fc-devicemgmt): add Kubernetes deployment manifests (#1)

Sprint 8 IMPL lane Cx-5: fc-devicemgmt K8s manifests (rebased onto main 2026-05-18; 13 files, +944).

Namespace + Web Deployment (replicas:2, MySQL backend) + Operator Deployment (replicas:1, KubeOps leader-elect) + Service + Certificate (step-ca-acme ClusterIssuer) + Traefik IngressRoute (devices.iamworkin.lan internal) + ServiceAccount + ClusterRole + ClusterRoleBinding + NetworkPolicy (CNI DNAT-aware backend ports) + OnePasswordItem (5-field consolidated) + ArgoCD Application bootstrap shape + lint coverage.

Follow-ups (not merge blockers):
- localhost/fc-devicemgmt-{web,operator}:v20260512-cx5 must be imported to all 3 RKE2 nodes; pods will ErrImageNeverPull until imported.
- 1Password vault item 'FlowerCore DeviceManagement Runtime' must be created with 5 fields before pods can start.
- DNS devices.iamworkin.lan -> 10.0.56.200 already present.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/fc-devicemgmt/argocd-application.yaml

@@ -0,0 +1,33 @@
+# Explicit ArgoCD Application shape for bootstrap/review.
+#
+# The live bluejay-infra ApplicationSet already discovers apps/* directories
+# and creates this same Application name (`infra-fc-devicemgmt`) automatically.
+# Keep repoURL on the internal Gitea ClusterIP URL; ArgoCD does not trust the
+# external step-ca HTTPS endpoint.
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: infra-fc-devicemgmt
+  namespace: argocd
+  labels:
+    app.kubernetes.io/name: fc-devicemgmt
+    app.kubernetes.io/part-of: flowercore
+    app.kubernetes.io/managed-by: argocd
+    flowercore.io/tenant-id: system
+    flowercore.io/created-by: bluejay-infra
+spec:
+  project: default
+  source:
+    repoURL: http://gitea-clusterip.gitea.svc.cluster.local:3000/bluejay/bluejay-infra.git
+    targetRevision: main
+    path: apps/fc-devicemgmt
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: fc-devicemgmt
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - ServerSideApply=true