Add ansible Galaxy remote type (#137)

ansible-galaxy installs pull collections straight from galaxy.ansible.com because artifactapi has no Galaxy remote type.

- add `ansible` package type proxying the Galaxy v3 API (discovery, collection versions, artifact downloads)
- forward digits-only `limit` (capped at 100) and `offset` on metadata paths, canonicalised; tarball paths forward no query
- rewrite only `href`, `download_url` and `links.*` to root-relative remote paths so tarballs flow through artifactapi
- treat `artifacts/*.tar.gz` as immutable and JSON metadata as mutable
- add `docs/ansible/remote.md`, a UI type def and an ansible e2e caching case

requires unkin/artifactapi#146

Reviewed-on: #137
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

ui/src/packagetypes/defs/ansible.ts

@@ -0,0 +1,16 @@
+import type { PackageTypeUI } from '../types';
+
+const def: PackageTypeUI = {
+  color: 'red',
+  snippets: ({ proxy }) => {
+    return [
+      {
+        title: 'Install collections through this Galaxy proxy',
+        language: 'bash',
+        code: `ansible-galaxy collection install community.general -s ${proxy}/api/`,
+      },
+    ];
+  },
+};
+
+export default def;