use placeholder host in docs

PLAN.md

@@ -672,7 +672,7 @@ func TestMain(m *testing.M) {
 
 ```hcl
 provider "artifactapi" {
-  endpoint = "https://artifactapi.k8s.syd1.au.unkin.net"
+  endpoint = "https://artifactapi.example.com"
 }
 
 resource "artifactapi_remote" "terraform_registry" {

docs/docker/local.md

@@ -5,9 +5,9 @@ Docker Registry HTTP API V2 for both push and pull, so any client (`docker`,
 `podman`, `skopeo`, `buildah`) can use it directly.
 
 ```sh
-docker tag myapp:latest artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
-docker push        artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
-docker pull        artifactapi.k8s.syd1.au.unkin.net/docker-internal/myapp:latest
+docker tag myapp:latest artifactapi.example.com/docker-internal/myapp:latest
+docker push        artifactapi.example.com/docker-internal/myapp:latest
+docker pull        artifactapi.example.com/docker-internal/myapp:latest
 ```
 
 The first path segment after `/v2/` is the artifactapi repo name; the remainder

docs/helm/local.md

@@ -10,6 +10,6 @@ member of a helm virtual to serve it alongside remotes.
 ```bash
 helm package ./mychart
 curl -fsSL --upload-file mychart-0.1.0.tgz \
-  https://artifactapi.k8s.syd1.au.unkin.net/api/v2/remotes/<repo>/files/mychart-0.1.0.tgz
-helm repo add <repo> https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/<repo>
+  https://artifactapi.example.com/api/v2/remotes/<repo>/files/mychart-0.1.0.tgz
+helm repo add <repo> https://artifactapi.example.com/api/v1/local/<repo>
 ```

docs/puppet/local.md

@@ -8,7 +8,7 @@ release's `metadata.json` at `/api/v1/local/<repo>`. Versions are immutable.
 ```bash
 puppet module build ./hello
 curl -fsSL --upload-file pkg/unkin-hello-0.1.0.tar.gz \
-  https://artifactapi.k8s.syd1.au.unkin.net/api/v2/remotes/<repo>/files/unkin-hello-0.1.0.tar.gz
+  https://artifactapi.example.com/api/v2/remotes/<repo>/files/unkin-hello-0.1.0.tar.gz
 puppet module install unkin-hello \
-  --module_repository https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/<repo>
+  --module_repository https://artifactapi.example.com/api/v1/local/<repo>
 ```

docs/terraform/local.md

@@ -9,7 +9,7 @@ no `.terraformrc` mirror config:
 terraform {
   required_providers {
     artifactapi = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/<repo>/<type>"
+      source  = "artifactapi.example.com/<repo>/<type>"
       version = "0.1.2"
     }
   }

ui/src/components/UsageInstructions.tsx

@@ -3,25 +3,14 @@ import './UsageInstructions.css';
 import { packageTypes } from '../packagetypes';
 import type { RepoClass, Snippet } from '../packagetypes/types';
 
-// baseURL resolves the externally reachable origin of this artifactapi instance.
-// The UI is served on the same origin as the API (client BASE is ''), so
-// window.location.origin is the address a host would actually curl/pull against
-// — no hardcoded hostname, works in prod and in `npm run dev` behind a proxy.
+// The UI is served on the same origin as the API, so this is the address clients use.
 function baseURL(): string {
-  if (typeof window !== 'undefined' && window.location?.origin) {
-    return window.location.origin.replace(/\/$/, '');
-  }
-  return 'https://artifactapi.k8s.syd1.au.unkin.net';
+  return window.location.origin;
 }
 
-// hostOnly is the bare host[:port] with no scheme, for docker/terraform source
-// addresses which are scheme-less.
+// hostOnly is host[:port] for scheme-less docker/terraform addresses.
 function hostOnly(): string {
-  try {
-    return new URL(baseURL()).host;
-  } catch {
-    return 'artifactapi.k8s.syd1.au.unkin.net';
-  }
+  return window.location.host;
 }
 
 // remoteProxyBase is where a remote (or virtual) repo's proxied artifacts live.