feat: add coverMetadataRef content type

[valentinludu]

Summary

Adds a new ContentType.coverMetadataRef for IPFS uploads used by the cover metadata feature. This allows db-api to upload a reference document ({ version: '1.0', coverMetadata: <uuid> }) to IPFS via the safe-ipfs-proxy.

• New Zod schema coverMetadataRefSchema in src/ipfs/schemas.ts
• New ContentType.coverMetadataRef enum value and CoverMetadataRef type in src/types/ipfs.ts
• Validation case added in src/ipfs/Ipfs.ts

Summary by CodeRabbit

• New Features
  • Added support for a new IPFS content type to expand available content options.

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📝 Walkthrough

Walkthrough

This PR introduces a new IPFS content type coverMetadataRef consisting of a version identifier and a UUID reference to cover metadata. The schema, type definitions, and enum extensions are added across types and schemas modules, then integrated into the IPFS content validator to parse and validate the new content type.

Changes

Add coverMetadataRef IPFS Content Type

Layer / File(s)	Summary
Schema and Type Definitions src/ipfs/schemas.ts, src/types/ipfs.ts	coverMetadataRefSchema defines the object structure with version fixed to 1.0 and coverMetadata as a UUID. ContentType.coverMetadataRef enum member is added and CoverMetadataRef type is inferred from the schema. IPFSContentTypes union and IPFSTypeContentTuple are extended to include the new type variant.
IPFS Content Validation src/ipfs/Ipfs.ts	validateIPFSContent switch statement gains a new branch for ContentType.coverMetadataRef that parses provided content via coverMetadataRefSchema.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add coverMetadataRef content type' accurately and concisely summarizes the main change: introducing a new IPFS content type for cover metadata references.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/cover-metadata-ref-content-type

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch feat/cover-metadata-ref-content-type

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