Add filebrowser InfisicalStaticSecret for basic-auth (parallel)

Phase 3a of migration #2: syncs FILEBROWSER_USERS from homelab/prod /filebrowser
via read-only infisical-operator/infisical-auth, template-remapped to the
lowercase 'users' key Traefik basic-auth requires, into parallel-name
filebrowser-auth-infisical. Old plaintext filebrowser-auth secret + the Traefik
Middleware untouched (repoint=3b, removal of the Secret stanza=3c).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

filebrowser/infisical-auth.yaml

@@ -0,0 +1,26 @@
+apiVersion: secrets.infisical.com/v1beta1
+kind: InfisicalStaticSecret
+metadata:
+  name: filebrowser-auth
+  namespace: filebrowser
+spec:
+  # Shared, read-only machine identity (no write grant, no PushSecret).
+  infisicalAuthRef:
+    name: infisical-auth
+    namespace: infisical-operator
+  sources:
+    - projectId: 17e98e9d-70f5-43d1-8382-7da818dfcdd0   # project "homelab"
+      environmentSlug: prod
+      secretPath: /filebrowser
+  syncOptions:
+    refreshInterval: 60s
+  targets:
+    - kind: Secret
+      name: filebrowser-auth-infisical          # parallel name — old filebrowser-auth stays live until 3c
+      namespace: filebrowser
+      creationPolicy: Owner
+      template:
+        engineVersion: v1
+        data:
+          # Remap UPPER_SNAKE Infisical key -> the lowercase `users` key Traefik basic-auth requires.
+          users: '{{ .FILEBROWSER_USERS.Value }}'