Add missing validation for optional fields (website, CIDs)

[Naomi-Gift]

Priority: Medium
Type: Enhancement
Description: Optional fields like website, logo_cid, metadata_cid, comment_cid should be validated:
Use constants from constants.rs (MAX_WEBSITE_LEN=256, MAX_CID_LEN=128)
Implement is_valid_ipfs_cid and is_valid_url from utils.rs (currently just return true)
Validate format and length

[Johnsource-hub]

@Johnsource-hub has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hey Maintainer,
would love to work on this issue

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[Ekenesamuel8]

@Ekenesamuel8 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello maintainer I will like to work on this issue

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[veemakama]

@veemakama has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, I'd love to work on this issue.

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[Danto1606]

@Danto1606 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this

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[muhahahmad68]

@muhahahmad68 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Kindly assign this to me, I'd like to work on it

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[drips-wave]

Congratulations, @Johnsource-hub! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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