Closes#34
## Summary
- At module load time, a `try/except` selects `yaml.CSafeLoader` / `yaml.CDumper` (C extensions) when libyaml is available, otherwise falls back to `yaml.SafeLoader` / `yaml.Dumper`
- `_HelmDumper` inherits from whichever dumper base was selected — custom datetime/date representers are registered the same way as before
- `_merge_helm_indexes` uses `yaml.load(raw_data, Loader=_YamlLoader)` instead of `yaml.safe_load`
- No change to `yaml.dump(...)` call — it already passes `Dumper=_HelmDumper`, which now inherits from the C base when available
- Five new tests in `TestYamlExtensionSelection` cover: loader/dumper base are classes, `_HelmDumper` inherits from the selected base, C extensions used when available, loader can parse YAML
## Measured performance gain
19-member `helm-all` virtual repo, real upstream data, Docker (AlmaLinux 9):
| | `merge=` time |
|---|---|
| Before (SafeLoader + Dumper) | **38,877ms** |
| After (CSafeLoader + CDumper) | **9,625ms** |
| Speedup | **4.0×** |
Local microbenchmark (500 charts × 10 versions × 19 members, 3 runs avg):
- Before: **40.8s** → After: **6.1s** (**6.7×** faster)
## Test plan
- [x] 283 unit tests pass (`make test`)
- [x] Wheel builds cleanly (`uv build --wheel`)
- [x] C extension confirmed available in AlmaLinux 9 container: `yaml.CSafeLoader: <class 'yaml.cyaml.CSafeLoader'>`
- [x] Baseline Docker timing measured with pure-Python path forced: merge=38,877ms
- [x] After Docker timing measured with C extension path: merge=9,625ms
Reviewed-on: #39
Closes#33
## Summary
- `_merge_helm_indexes` now parses each member's raw YAML first, then rewrites `urls` entries in-place via the new `_rewrite_urls` helper
- **Relative URLs** (e.g. `rancher-2.13.1.tgz`) are prepended with `{proxy_base}/api/v1/remote/{member_name}/`
- **Absolute URLs** matching `base_url` are rewritten to the proxy path (existing behaviour, now correct)
- **Absolute URLs** with a different prefix are left unchanged
- Removes the `_helm.resolve_content` raw-bytes detour from the virtual merge path; `remote/helm.py` is unchanged (still used for direct remote proxying)
## Test plan
- [x] 278 unit tests pass (`make test`)
- [x] New `TestRewriteUrls` class covering relative, absolute-match, absolute-no-match, leading-slash, and multi-URL cases
- [x] New `test_relative_urls_rewritten_to_proxy` in `TestMergeHelmIndexes`
- [x] Updated `test_first_member_wins_on_duplicate_name_and_version` to assert on proxy remote name (not upstream hostname)
- [x] Live Docker test: Rancher `index.yaml` relative URLs rewritten correctly to `http://localhost:8000/api/v1/remote/rancher-stable/rancher-2.14.1.tgz` etc.
- [x] `helm-all` virtual (19 members) returns HTTP 200 with 395k-line merged index on cache miss
Reviewed-on: #37
Repository types now live under dedicated top-level keys instead of a
shared remotes: block distinguished by a type field:
remotes: caching proxy remotes (no type field needed)
virtuals: virtual merged-index repositories
locals: local upload repositories
Routes for local repos move from /api/v1/remote/ to /api/v1/local/.
config.py gains get_virtual_config() and get_local_config() lookups.
Root endpoint now reports all three sections. Drop root conf.d/ (was
an exact duplicate of examples/conf.d-method/).
Reviewed-on: #31
Adds a new virtual repo type that merges indexes from multiple member remotes
of the same package type. Currently supports helm (index.yaml merge with URL
rewriting). Member fetches run in parallel; merged index is Redis-cached at
min(mutable_ttl) across members.
Reviewed-on: #30
unkinben