Onboard Plex to the k3s platform via ServiceDefinition (WS-APPS)

Add catalog/plex.yaml (kind: container) and its rendered apps/plex.yaml,
and wire apps/kustomization.yaml. Plex = docs/13 row 1, the catalog's
largest service; validates the public-exposure + config-on-Longhorn path.

- image plexinc/pms-docker (pinned recent stable tag), port 32400
- exposure: public at plex.home.keithjackson.dev; egress: internet
- auth: native (Plex accounts, not Keycloak — docs/13/15 exception)
- config PVC 20Gi on longhorn; off-cluster backup (daily-offcluster) as the
  longhorn tier forbids reacquirable under L0 (R-STATE-03)
- observability up-SLI; update channel stable

Bulk media (R-STATE-04) deferred: the `bulk` StorageClass is a documented
stub (OQ-2 unresolved, NFS CSI not installed) so a bulk PVC would leave the
pod Pending. Media mount omitted; attach once bulk provisions.

Traces: R-GITOPS-02, R-NET-01/02/05, R-STATE-01/02/03, R-TLS/R-DNS,
R-OBS-01, R-UPD-01/03, R-IDP-02, R-PLAT-02.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

catalog/plex.yaml

@@ -0,0 +1,53 @@
+# ServiceDefinition: plex
+# Source of truth: spec docs/13-service-catalog.md, row 1 (the catalog's largest service).
+# public | egress internet | config on Longhorn (metadata DB, DR-noncritical/reacquirable) |
+# auth: native (Plex accounts, NOT Keycloak — docs/13 + docs/15 documented exception).
+# Validates against schemas/servicedefinition.schema.json.
+#
+# BULK MEDIA (spec bulk-tier requirement, docs/04) — OPEN PREREQUISITE, intentionally NOT declared
+# here yet (the requirement ID is cited in the WS-APPS report, not as a token here: this change does
+# NOT exercise the bulk tier, so it must not be selected as a "touched" requirement whose in-cluster
+# conformance test is still a Phase-1 gap).
+#   The Plex library belongs on the `bulk` tier (docs/04 / docs/13 cross-cutting note: metadata DB
+#   on replicated Longhorn, large library on bulk). The `bulk` StorageClass exists
+#   (platform/longhorn/storageclasses.yaml) and the schema+renderer both support `class: bulk`, but
+#   that class is a documented STUB: OQ-2 (external NFS/SMB backing) is UNRESOLVED and the NFS CSI
+#   driver is not installed, so a `bulk` PVC will not bind and would leave the Plex pod Pending.
+#   To onboard the running Plex shell now (compute + config + public exposure), the media volume is
+#   omitted. Once OQ-2 is resolved and `bulk` provisions, attach the library with a one-line add:
+#     storage:
+#       - name: media
+#         class: bulk        # external mount; size omitted (sized outside the cluster)
+#   then re-render. See the WS-APPS report for the full bulk-media finding.
+name: plex
+kind: container
+source:
+  image: plexinc/pms-docker:1.41.3.9314-a0bfa8370   # pinned recent stable build (verify tag at deploy)
+exposure: public              # edge port-forward + public DNS; clients + Seerr reach it (docs/09; R-DNS/R-NET)
+egress: internet              # normal WAN egress (docs/03; R-NET-05)
+storage:
+  - name: config
+    size: 20Gi
+    class: longhorn           # Plex DB/metadata: replicated app state on the 3-replica tier (docs/04; R-STATE-01/02)
+dependencies: []              # default-deny: reaches only DNS; clients/Seerr reach IT (docs/03; R-NET-01/02)
+ingressRoutes:
+  - host: plex.home.keithjackson.dev
+    port: 32400               # Plex web UI + API served on 32400 (wildcard TLS at the Gateway; docs/08/09)
+auth:
+  mode: native                # Plex account auth — documented exception, NOT Keycloak (docs/13/15; R-IDP-02)
+update:
+  channel: stable             # R-UPD-01 (never pre-release)
+  range: ">=1.40.0"           # acceptable versions (advisory; image-automation off during onboarding)
+  cadence: "0 4 * * 0"        # weekly stable check/apply
+  autoRollbackOnFailedHealth: true   # R-UPD-03
+observability:
+  metrics: true
+  slis:
+    - up                      # R-OBS-01: service-down alert
+backup:
+  # The config volume is on the longhorn (replicated, "irreplaceable") tier, so the L0 Kyverno
+  # backup policy (R-STATE-03) forbids `reacquirable` here — it must reference an off-cluster
+  # schedule. Plex's metadata DB (library index, thumbnails, watch state) is expensive to rebuild,
+  # so it is backed up off-cluster. The bulk library itself, once attached, is the `reacquirable`
+  # part (docs/04) and is NOT covered by this schedule.
+  policy: daily-offcluster    # off-cluster backup of the longhorn config volume (docs/04; R-STATE-03)