feat(auth): gate jackett/qbittorrent/radarr/sonarr UIs with oauth2-proxy sidecar (rollout)

Roll the verified Option-B per-app oauth2-proxy sidecar out to the remaining
four forward-auth apps after the pihole canary was confirmed fail-closed
(unauthenticated -> 302 to Keycloak, pod 2/2, clean sidecar OIDC discovery).

Each app's Gateway route now terminates at its oauth2-proxy sidecar (:4180,
--allowed-group=media-users, --upstream=http://127.0.0.1:<uiport>); the
gateway-ingress CiliumNetworkPolicy allows the Gateway to reach ONLY :4180, so
the bare UI is never served un-authenticated (fail-closed; R-IDP-02/06). The
apps' own app/API ports stay in-Service for EAST-WEST callers (arr ->
qbittorrent:8080 / jackett:9117) via the existing reciprocal-ingress allows.

- keycloak: confidential jackett/qbittorrent/radarr/sonarr clients (realm-import
  + realm-clients mirror), provisioned live via kcadm (groups membership mapper).
- secrets: four SOPS/age <app>-oauth2-proxy-credentials, wired into apps/wave-0
  and apps/wave-1 by the renderer's sidecar-creds wave rule.
- ci: remove the temporary canary deferral (all five goldens now reproduce).

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

apps/wave-0/jackett-oauth2-proxy-credentials.sops.yaml

@@ -0,0 +1,30 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: jackett-oauth2-proxy
+    namespace: jackett
+type: Opaque
+stringData:
+    client-id: ENC[AES256_GCM,data:n5h6NG0emA==,iv:d6lvZfgRq6+IKNpsSoRa5a38R2f2+tWBO+j9QKDThMY=,tag:P+cvQXlWR4aZs7a9/lVuMQ==,type:str]
+    client-secret: ENC[AES256_GCM,data:WL5G7PuVTdHQoe7Zp2eiE9ppxSGE0+W2RMfISuwqD6JA9auG97ZYnPUjG8HNx7sosOvsmqeE9kONK23IqIeaQw==,iv:kSP10UKeDv/8BsgX36+uKwEY+LBovcicce1RkD14M4g=,tag:fEUsVuajWPxAmAo8Nnrrrg==,type:str]
+    cookie-secret: ENC[AES256_GCM,data:WChW9YLhzG9Nwp8dCWTFtirufXxGk3Ep9HXpfqcNz69PXQW3RaMC4EJpw2U=,iv:f6obIerkog8Q2gfj1tVL259LOl5jj59VE29KnJwmCXQ=,tag:s0FwNtU6vffKgDcGUNUhCg==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age175l8mdpdfu7hq0aml3exs3gykarwjmuvr23sq56s3wjejnyk44wsp4mfzg
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBLWVptVHc4aFl0MXRWTHVP
+            cC9qcVoyZUV2TGZnTEpHY3RLOU8vQnNNNm00ClZRejE2bzFaWXNSUmQ5MEZtV3VK
+            djB2TXJqQjVUOE93QjN6U0lMVDBEbm8KLS0tIFFTZnB0c2pCZWZMZ084WEIxT2tW
+            WUxxemJHdWRZbnBpL280dzlpMmhwSW8Kra0bkx3iJYQi+3rnpU/89fJbJHzQjKi2
+            ZWNwYhLpULw1xNo3xbCm+PUp5f30kpyMKQld2qaLOZAqWI5vNl9Byw==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-08-31T13:41:37Z"
+    mac: ENC[AES256_GCM,data:zU9nWCrSomAXAZ/Ve8U3yLHnoxhu8nkQ7523neJTGv810ONzAAZ7Gr8nFHR7bTqz2QwuGYD3P1ypdqYnKLM8ri2Zf1LDo/Su9ptnvQhUbfXKlRorcW6uAWsViCwvTM05wZNkdzZfza7tGwJQVTD6hc0cP+/7Y7JnpT5FEstK254=,iv:oggTRjcWqAJizA/a22+mtslkEWka8hUG0wudM8obO4g=,tag:i0TtNmqGe+b5t4iq8LpsqA==,type:str]
+    pgp: []
+    encrypted_regex: ^(data|stringData)$
+    version: 3.9.4