[WIP] Add DID validation and support existing blob refs for profile images

[Copilot]

Changes based on review comments

• Fix DID validation regex to allow digits in method name (e.g., did:key2:, did:btc1:)
• Add test cases for DID methods with digits
• Strengthen isJsonBlobRef type guard to validate nested ref.$link structure
• Export BlobInput type from main index.ts
• Add edge case tests for malformed blob references
• Update JSDoc comment for isValidDid() to reflect digits in method names
• Remove package-lock.json (monorepo uses pnpm)
• Add package-lock.json to .gitignore
• Verify build passes - ✅ All builds successful
• Run full test suite - ✅ 870 tests passed

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Latest commit: f04f5f2

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