feat(igotify): wire the assist bridge with a Gotify client token

The bridge runs server-side, so it cannot run a browser flow and ZITADEL has no
part in it. Give it a Gotify client token instead: GOTIFY_URLS points at the
public host, GOTIFY_CLIENT_TOKENS comes from a SOPS secret.

The token belongs to user `rock`, is named igotify-assist, and has
expiresAfterInactivitySeconds 0 so it never idles out. Delete the client row in
Gotify to revoke it.

Verified with the token: GET /client returns 200 and GET /message returns the
latest message.

k8s/argocd/secrets/igotify-client-token.enc.yaml

@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: igotify-client-token
+    namespace: notifications
+type: Opaque
+data:
+    client-token: ENC[AES256_GCM,data:W+InmDyZkU0i+OqQUsIaRNY/3p6zjMC19ASj/qYHTldhtGmHwj4koQX3tIxdCQV72xZKOxsc8eV3hGX3pqbW02c2/ng=,iv:wWI5AZdpxnzX61f8iTiWmxKcDFMaFM4PHFYo4DMBK4Q=,tag:CpE8Kg5V8fL7P3oAjWjSvQ==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1e5fq3hwxy78psus2nfvmtmua36g0u3suk78ephw6246l974d2utsvn0hla
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAwaUlFU0xKaEs0SWcxWEEr
+            T0tUSmErR08zVkhuLy9VMEc3VXdmU1o3cWdrCjhuOW1yTmZPdWxDZHhMeUZtQlcz
+            UmVzaEMyVHZOZS9KVHdMd2pndUJwUW8KLS0tIGxYeENwVEFDdUpDTGszdGtNRHBQ
+            Y041WW9HdTJwUlJCUGhMN2RGZWZpUmMKiQbi/O9X3cFJgqw3tvwWcyy8QKkUuq/7
+            Y+V51R/WFobEQuAZLmDKgWcPSGt51effufB/Vm9LRRqtbkbYQAIoXQ==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-10-27T19:14:20Z"
+    mac: ENC[AES256_GCM,data:Hxl7AGzMOMK0pwe6T9ZmrE6K45XhQkq4qk/7YkrVuneL1e7jc8Bmv4NlywqRkt9fPVOCMwKikeX9U3ZcsqK13xPPfm1CmAxV3CCluwK0/9589N70OQxL4qJSkO6CXyGaa0Y9wVRX4y/N3wSjW+d25+GOYUXrOxkRpVyU4GFSqAQ=,iv:0Af/MCZBEYJVI3yi7DpPX1eBKwSANXJPCpSAEE3zCq4=,tag:SS1U9TfRQR3z8KkoQ6ZuZA==,type:str]
+    pgp: []
+    encrypted_regex: ^(data|stringData)$
+    version: 3.9.3

k8s/argocd/secrets/secret-generator.yaml

@@ -36,6 +36,7 @@ files:
     - etcd-defrag-creds.enc.yaml
     - zitadel-masterkey.enc.yaml
     - smtp-gotify-secrets.enc.yaml
+    - igotify-client-token.enc.yaml
     # Login UI RSA keypair, adopted from the chart-generated Secret so ArgoCD
     # owns it. Without this, the chart re-generates the keypair on every render,
     # which changes checksum/secret-login-service-key and leaves both Zitadel