* Fix startup message and add connectivity check for S3 storage
When S3 storage is configured, the startup log incorrectly showed the
default local path (./cache/artifacts) instead of the actual S3 URL.
This also adds a lightweight connectivity check at startup so bad
credentials or endpoints fail immediately rather than on first request.
Add URL() and Close() to the Storage interface so all backends report
their URL and can be cleaned up properly. Rename the stats JSON field
from storage_path to storage_url. Close storage in error paths and
during graceful shutdown.
Fixes#49
* Fix Windows test assertion for file:// URL format
OpenBucket normalizes Windows paths to file:///C:/path (three slashes)
but the test expected file://C:/path (two slashes).
* Fix container blob caching by passing auth token to fetcher
The container handler was calling GetOrFetchArtifactFromURL without
authentication headers, causing Docker Hub to return 401. The fallback
proxyBlobWithAuth path had auth but bypassed the cache entirely.
Now passes the Bearer token through GetOrFetchArtifactFromURLWithHeaders
so blobs are both authenticated and cached.
Fixesgit-pkgs/proxy#43
* Update registries to v0.4.0
Replace pre-release pseudo-version with the released v0.4.0 now that
git-pkgs/registries#13 has been merged.
* Fix all golangci-lint issues across the codebase
Resolve 77 lint issues reported by golangci-lint with gocritic, gocognit,
gocyclo, maintidx, dupl, mnd, unparam, ireturn, goconst, and errcheck
enabled. Net reduction of ~175 lines through shared helpers and
deduplication.
* Suppress staticcheck SA1019 for intentional deprecated field usage
The Storage.Path field is deprecated but still read for backwards
compatibility with existing configs that haven't migrated to the URL field.
