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-1/radarr-oauth2-proxy-credentials.sops.yaml

@@ -0,0 +1,30 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: radarr-oauth2-proxy
+    namespace: radarr
+type: Opaque
+stringData:
+    client-id: ENC[AES256_GCM,data:vFLxqzxt,iv:6k0ZjKP8rvg56ZFPWEGdyj+FLgK+LBOE0pLBWfC0bjA=,tag:LiZb5BasJAEWM1c3I8vFTA==,type:str]
+    client-secret: ENC[AES256_GCM,data:JzfHF8JF4YUxBxiC738N4UsMlcCOvxn4/AE2B4meZNGAZb2uhG4n51uEY8OQsbsM0Ni4qM2Wi17KuLDwAicfUA==,iv:A3AnUhYxw/IWfvfcZf6MgC5u37dMoNToIWxRG9AxEJQ=,tag:1OY2pWGTbCxPYYdaiBa/oA==,type:str]
+    cookie-secret: ENC[AES256_GCM,data:LPt5nghLfoNvr7yBes8rLeEK3M6UVIO1h9POHMOAj8iZX3l2RJJa4w8GcSg=,iv:Q5+7zH8Tb1SWe92B0pxekfMgOXlBG8nixWn/ho4oJw4=,tag:D+41dBFPVTGj86xv5/GEng==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age175l8mdpdfu7hq0aml3exs3gykarwjmuvr23sq56s3wjejnyk44wsp4mfzg
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBHVG5MWVRyOVl1RWFpOExC
+            SjZKcEd1ZlFnZVZ5NmtyUlQzRGI1b1o3dG04CkwrTUNjd3crM1VzaUdPczliSDY1
+            a3dONnBFWk8yOW5kL2xES1RZbUN6L3cKLS0tIG9hWG9Cbm01RlMrcC9zMWkxeFgr
+            ZnRGRUVTTS81SFRyenNsZUZEcG1TUm8K5XUGP/1NVsoaFcBZUER3/zMPTtCuVisT
+            LrbSmTkIyVfzjN/vRpRH92b1VzENJvhGhRghhQaKY0rbG34i6yh3Vw==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-08-31T13:42:25Z"
+    mac: ENC[AES256_GCM,data:TxdPz2zE6+ypgQG2b0Rp3VFiPL7LLls4NNkC7YQ/bVCLvyvaXdGsEWkiHJE+Po7hcESmZRt/NMS25mEXPMfvlSCltwFUTcrxoZDS0NI27kIzbtceTbxmznt/dMS/iZm21lCgA6Aag9ByLjWusPLkRKWhep+G+0G54qtfQzv3s80=,iv:44f0KikrpKpnSaLLyzTvnCfrwEXylRgVIlKMtSpMyNc=,tag:jDx43n0usDtbwzo8KzDBqw==,type:str]
+    pgp: []
+    encrypted_regex: ^(data|stringData)$
+    version: 3.9.4