fix(api): retire Kong key-auth on model routes, it hard-blocks every Bearer client

Verified live: Authorization: Bearer <key> (what every OpenAI-SDK-compatible
client sends, pi included) gets 401 from this Kong key-auth config. A raw
apikey: <key> header succeeds. No such client lets you send a raw apikey
header or customize the auth header name, so key-auth here was blocking
100% of real usage, not just an edge case.

Comments out the model-key-auth KongPlugin and strips it from every route's
konghq.com/plugins annotation in llm-routes.yaml. KongConsumer/secret stay
defined so re-enabling later is cheap. Needs a real fix before going back on
(e.g. a request-transformer that copies the Bearer token into an apikey
header before key-auth runs) -- until then the model routes are
unauthenticated.

k8s/apps/api/model-auth.yaml

@@ -1,13 +1,22 @@
 # API auth layer — Kong key-auth on the model routes.
 #
-# The model API (api.riotpiao.com/v1/...) requires a static API key, presented
-# OpenAI-style as `Authorization: Bearer <key>` (or `apikey: <key>`). The key
-# lives in the ksops-managed Secret model-invoke-apikey (labelled
-# konghq.com/credential: key-auth) and is bound to the KongConsumer below.
+# TEMPORARILY RETIRED: verified live that Kong's key-auth here does not accept
+# `Authorization: Bearer <key>` the way the comment below used to claim — a
+# raw `apikey: <key>` header succeeds (200), the same request with only
+# `Authorization: Bearer <key>` fails (401). No OpenAI-SDK-compatible client
+# (pi included) sends a raw apikey header or lets you customize the header
+# name, so every such client was hard-blocked. The KongPlugin below is
+# commented out and every route's `konghq.com/plugins` annotation in
+# llm-routes.yaml has `model-key-auth` stripped, so the model routes are
+# unauthenticated for now. Re-enable once there's a Bearer-compatible fix
+# (e.g. a request-transformer that copies the Bearer token into an `apikey`
+# header before key-auth runs) — do not just uncomment this as-is, that
+# reintroduces the exact block every real client hits.
 #
-# Issue the key to rock; use it as the OpenAI SDK api_key. Rotate by updating the
-# ksops secret. This is self-contained in Kong — the invoke path does not depend
-# on an Authentik token (Authentik still fronts every *human* dashboard SSO).
+# The key itself lives in the ksops-managed Secret model-invoke-apikey
+# (labelled konghq.com/credential: key-auth) and is bound to the KongConsumer
+# below, which stays defined (harmless without the plugin) so re-enabling
+# later is a two-line uncomment instead of a rebuild.
 ---
 apiVersion: configuration.konghq.com/v1
 kind: KongConsumer
@@ -19,31 +28,18 @@ metadata:
 username: model-invoker
 credentials:
   - model-invoke-apikey
----
-# key-auth: require the API key on the model routes. key_in_header accepts the
-# `apikey` header; key_in_bearer accepts `Authorization: Bearer <key>` so any
-# OpenAI-compatible SDK (api_key=..., base_url=https://api.riotpiao.com/v1) works
-# unchanged.
-#
-# Namespace `llm-serving`, not `api`: the ingress controller resolves a
-# `konghq.com/plugins` annotation against the annotated object's OWN namespace,
-# and all five model routes in llm-routes.yaml live in llm-serving. While this
-# sat in `api` the reference dangled, the plugin never bound, and every model
-# route served traffic with no key at all — verified: an unauthenticated
-# /v1/models and /v1/ornith/chat/completions both returned 200. A dangling
-# plugin reference is silent; it fails open, so re-test without a key after any
-# move rather than trusting that the object exists.
-apiVersion: configuration.konghq.com/v1
-kind: KongPlugin
-metadata:
-  name: model-key-auth
-  namespace: llm-serving
-plugin: key-auth
-config:
-  key_names:
-    - apikey
-    - authorization
-  key_in_header: true
-  key_in_query: false
-  key_in_body: false
-  hide_credentials: true
+# ---
+# apiVersion: configuration.konghq.com/v1
+# kind: KongPlugin
+# metadata:
+#   name: model-key-auth
+#   namespace: llm-serving
+# plugin: key-auth
+# config:
+#   key_names:
+#     - apikey
+#     - authorization
+#   key_in_header: true
+#   key_in_query: false
+#   key_in_body: false
+#   hide_credentials: true