fix: align stat metadata content-type output with mc

[overtrue]

Summary

This PR fixes rc stat output parity with mc stat for object metadata display.

Fixes #46.

Problem

When running rc stat for an object, the output showed:

• Type : text/plain (MIME type in the Type field)
• no dedicated Metadata section containing Content-Type

Issue #46 reports that Content-Type should be shown in metadata output similarly to mc stat.

Root Cause

stat human-readable formatting treated content_type as the Type field and only rendered user-defined metadata (x-amz-meta-*) lines, so Content-Type was never emitted as metadata.

Changes

• Added build_display_metadata() to compose sorted metadata lines for display.
• Mapped object type explicitly as Type : file in human-readable output.
• Added a Metadata section in human-readable output.
• Included Content-Type inside the metadata display section.
• Kept JSON output behavior unchanged.
• Added unit test: test_build_display_metadata_includes_content_type.

Verification

Reproduction (before fix)

Using Docker RustFS latest:

1. docker compose -f docker/docker-compose.yml up -d rustfs
2. cargo run -- alias set local http://localhost:9000 accesskey secretkey
3. cargo run -- mb local/issue46-bucket
4. cargo run -- cp /tmp/issue46.txt local/issue46-bucket/issue46.txt
5. cargo run -- stat local/issue46-bucket/issue46.txt

Observed before fix:

• Type : text/plain
• no Metadata section / no Content-Type metadata line

After fix

Now output includes:

• Type : file
• Metadata :
• Content-Type : text/plain

Quality Gates

• cargo fmt --all --check
• cargo clippy --workspace -- -D warnings
• cargo test --workspace

All passed.

Similar Issue Scan

Searched other CLI commands for comparable content_type display bugs; no additional stat-like human-readable metadata formatting paths requiring fixes were found.

[Copilot]

Pull request overview

Updates the rc stat CLI command’s human-readable output to match mc stat expectations by moving Content-Type into a dedicated metadata display section and ensuring the Type field reflects the object kind rather than the MIME type.

Changes:

• Added build_display_metadata() to compose sorted, human-readable metadata (including Content-Type plus X-Amz-Meta-* entries).
• Changed human-readable Type output from MIME type to a fixed object kind (file) and introduced a Metadata section.
• Added a unit test verifying build_display_metadata() includes Content-Type.

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