Add Ansible storage role for NVMe setup and Longhorn dual-disk config

Automates LV expansion, NVMe mount, and Longhorn node disk tagging
(hdd/nvme) via Ansible instead of Kustomize-managed manifests.

infra/ansible/inventory/host_vars/catherby.yaml

@@ -0,0 +1,7 @@
+---
+node_labels:
+  - topology.kubernetes.io/zone=rack1
+  - node.kubernetes.io/instance-type=nuc
+
+# NVMe partition UUID (Samsung 980 Pro 1TB, partition 3)
+nvme_partition_uuid: "65246002-2f17-4f55-add4-a6441d484ecc"

infra/ansible/playbooks/storage.yaml

@@ -0,0 +1,6 @@
+---
+- name: Configure storage (expand LV + mount NVMe)
+  hosts: k3s_cluster
+  become: true
+  roles:
+    - storage

infra/ansible/roles/storage/tasks/main.yaml

@@ -0,0 +1,60 @@
+---
+- name: Extend root LV to use all free VG space
+  community.general.lvol:
+    vg: ubuntu-vg
+    lv: ubuntu-lv
+    size: +100%FREE
+    resizefs: true
+  register: lv_extend
+  failed_when:
+    - lv_extend.failed
+    - "'matches existing size' not in (lv_extend.msg | default(''))"
+
+- name: Create NVMe storage mount point
+  ansible.builtin.file:
+    path: /mnt/nvme-storage
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: Mount NVMe partition
+  ansible.posix.mount:
+    path: /mnt/nvme-storage
+    src: UUID={{ nvme_partition_uuid }}
+    fstype: ext4
+    opts: defaults,noatime
+    state: mounted
+
+- name: Create Longhorn data directory on NVMe
+  ansible.builtin.file:
+    path: /mnt/nvme-storage/longhorn
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: Configure Longhorn node disks (HDD + NVMe with tags)
+  kubernetes.core.k8s:
+    state: patched
+    api_version: longhorn.io/v1beta2
+    kind: Node
+    name: "{{ inventory_hostname }}"
+    namespace: longhorn-system
+    definition:
+      spec:
+        disks:
+          default-disk-d4d0a27486e915cd:
+            allowScheduling: true
+            path: /var/lib/longhorn/
+            storageReserved: 32212254720
+            tags:
+              - hdd
+          nvme:
+            allowScheduling: true
+            path: /mnt/nvme-storage/longhorn/
+            storageReserved: 10737418240
+            tags:
+              - nvme
+  delegate_to: localhost
+  become: false

infra/kubernetes/platform/longhorn/kustomization.yaml

@@ -4,4 +4,3 @@ resources:
   - application.yaml
   - namespace.yaml
   - servicemonitor.yaml
-  - node-disks.yaml

infra/kubernetes/platform/longhorn/node-disks.yaml

@@ -0,0 +1,26 @@
+# Patches the Longhorn Node to configure two disks with tags:
+#   - default-disk (HDD at /var/lib/longhorn/) tagged "hdd"
+#   - nvme-disk (NVMe at /mnt/nvme-storage/longhorn/) tagged "nvme"
+#
+# Apply after Longhorn is running and the NVMe is mounted:
+#   kubectl apply -f node-disks.yaml
+apiVersion: longhorn.io/v1beta2
+kind: Node
+metadata:
+  name: catherby
+  namespace: longhorn-system
+spec:
+  allowScheduling: true
+  disks:
+    hdd:
+      allowScheduling: true
+      path: /var/lib/longhorn/
+      storageReserved: 32212254720  # 30Gi reserved for system
+      tags:
+        - hdd
+    nvme:
+      allowScheduling: true
+      path: /mnt/nvme-storage/longhorn/
+      storageReserved: 10737418240  # 10Gi reserved
+      tags:
+        - nvme