artifactapi: serve plain HTTP without HTTPS redirect (#336)

## Why

Early-boot clients — anaconda/kickstart and yum in %post, PXE environments — need direct HTTP access to the artifactapi rpm repos. The current setup returns a 301 redirect from HTTP to HTTPS, which those minimal clients cannot follow (or downgrade insecurely), breaking rpm installs.

## Changes

- Attach the `api-route` HTTPRoute to the Gateway's `http` (port 80) listener alongside `https`, so `http://artifactapi.k8s.syd1.au.unkin.net/...` serves app content directly (200/40x from the app, no Location header).
- Remove the `http-redirect` HTTPRoute (RequestRedirect 301 `http`->`https`), which was the sole redirect mechanism — the traefik `web` entrypoint has no global `redirections`, so this is scoped strictly to artifactapi and does not affect other apps.
- Leave HTTPS unchanged.

https://claude.ai/code/session_01JUoARVdmhxKQHyyyp1pxeT
---------

Co-authored-by: Ben Vincent <neotheo@gmail.com>
Reviewed-on: #336
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/base/artifactapi/httproute.yaml

@@ -1,30 +1,6 @@
 ---
 apiVersion: gateway.networking.k8s.io/v1
 kind: HTTPRoute
-metadata:
-  name: http-redirect
-  namespace: artifactapi
-spec:
-  hostnames:
-    - artifactapi.k8s.syd1.au.unkin.net
-  parentRefs:
-    - group: gateway.networking.k8s.io
-      kind: Gateway
-      name: artifactapi
-      sectionName: http
-  rules:
-    - filters:
-        - type: RequestRedirect
-          requestRedirect:
-            scheme: https
-            statusCode: 301
-      matches:
-        - path:
-            type: PathPrefix
-            value: /
----
-apiVersion: gateway.networking.k8s.io/v1
-kind: HTTPRoute
 metadata:
   name: api-route
   namespace: artifactapi
@@ -32,6 +8,12 @@ spec:
   hostnames:
     - artifactapi.k8s.syd1.au.unkin.net
   parentRefs:
+    # Early-boot clients (anaconda/kickstart, yum in %post, PXE) need plain HTTP
+    # for the rpm repos; serve the app directly on port 80 instead of redirecting.
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: artifactapi
+      sectionName: http
     - group: gateway.networking.k8s.io
       kind: Gateway
       name: artifactapi