test: add fuzz testing for validation.rs CID and URL validators

[Naomi-Gift]

validate_bounty_url and validate_bounty_cid in validation.rs use string prefix and length checks that could have edge cases with malformed inputs. Fuzz tests (using cargo-fuzz or afl.rs) should be added to ensure the validators correctly reject malformed inputs without panicking.

[Zarmaijemimah]

Hi maintainer I’ll love to work on this issue please kindly assign thank you

[Big-Rahm]

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[samuelelijah585]

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Hello, I've reviewed the issue and its acceptance criteria, and I'm confident I can deliver a solution that meets the requirements. I'd appreciate it if you could assign this issue to me. Thank you!

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[gadst12]

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Hi maintainer, I'd like to work on this issue

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