umami: add Infisical StaticSecret (/umami passthrough, parallel name)

3a of the umami-secrets centralization. Adds umami-secrets-infisical synced
from homelab/prod /umami (3 lowercase-hyphenated keys, passthrough).
Parallel name — old out-of-band umami-secrets stays live until 3c.

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

umami/infisical-umami-secrets.yaml

@@ -0,0 +1,26 @@
+apiVersion: secrets.infisical.com/v1beta1
+kind: InfisicalStaticSecret
+metadata:
+  name: umami-secrets
+  namespace: umami
+spec:
+  # Shared, read-only machine identity (no write grant, no PushSecret).
+  # Source is the /umami folder: app-secret (umami signing key), database-url
+  # (postgresql://user:pass@host — EMBEDS postgres-password), postgres-password.
+  # Infisical key names already match the deployments' secretKeyRef.key values
+  # (lowercase-hyphenated), so this is straight passthrough.
+  infisicalAuthRef:
+    name: infisical-auth
+    namespace: infisical-operator
+  sources:
+    - projectId: 17e98e9d-70f5-43d1-8382-7da818dfcdd0   # project "homelab"
+      environmentSlug: prod
+      secretPath: /umami
+  syncOptions:
+    refreshInterval: 60s
+  targets:
+    - kind: Secret
+      name: umami-secrets-infisical      # parallel name — old secret stays live until 3c
+      namespace: umami
+      creationPolicy: Owner
+      # key passthrough: synced Secret carries app-secret, database-url, postgres-password verbatim