feat(wiki): implement Google OKF v0.2 migration, decoupled audit CronJob, and SilverBullet web portal

- Update OpenClaw memory-wiki renderMode to 'native'
- Add decoupled Kubernetes CronJob openclaw-wiki-audit for OKF health checks
- Deploy SilverBullet PWA at wiki.moritzgraf.de with shared volume and Git auto-commit
- Add SilverBullet forward-auth proxy provider and admin policy in Authentik Terraform
- Update knowledge-wiki submodule to OKF v0.2 schema migration commit

terraform/authentik.tf

@@ -330,6 +330,22 @@ resource "authentik_application" "n8n" {
   protocol_provider = authentik_provider_proxy.n8n.id
 }
 
+# 9. SilverBullet Wiki
+resource "authentik_provider_proxy" "silverbullet" {
+  name                  = "SilverBullet"
+  external_host         = "https://wiki.moritzgraf.de"
+  mode                  = "forward_single"
+  authorization_flow    = data.authentik_flow.default_authorization_flow.id
+  invalidation_flow     = data.authentik_flow.default_invalidation_flow.id
+  intercept_header_auth = true
+}
+
+resource "authentik_application" "silverbullet" {
+  name              = "SilverBullet"
+  slug              = "silverbullet"
+  protocol_provider = authentik_provider_proxy.silverbullet.id
+}
+
 # --- Outpost: Embedded Proxy Outpost ---
 
 resource "authentik_outpost" "embedded" {
@@ -344,6 +360,7 @@ resource "authentik_outpost" "embedded" {
     authentik_provider_proxy.hass_coder.id,
     authentik_provider_proxy.openclaw.id,
     authentik_provider_proxy.n8n.id,
+    authentik_provider_proxy.silverbullet.id,
   ]
 }
 
@@ -717,6 +734,12 @@ resource "authentik_policy_binding" "minio_admin_only" {
   order  = 0
 }
 
+resource "authentik_policy_binding" "silverbullet_admin_only" {
+  target = authentik_application.silverbullet.uuid
+  group  = authentik_group.infra_admins.id
+  order  = 0
+}
+
 # 2. Shared & Member Applications (Accessible to all authenticated users)
 resource "authentik_policy_binding" "grafana_users" {
   target = authentik_application.grafana.uuid