Implement automated fuzz testing pipeline with cargo-fuzz

[Smartdevs17]

Description

No fuzz testing pipeline exists. Implement automated fuzz testing for contract functions to discover edge cases and vulnerabilities.

Acceptance Criteria

• cargo-fuzz integration for contract targets
• Fuzz targets for critical functions (deposit, borrow, liquidate, repay)
• CI fuzz run with 30-minute minimum duration
• Crash triage and regression test generation
• Corpus management with seed corpora
• Coverage report for fuzz testing

Technical Scope

• stellar-lend/fuzz/
• .github/workflows/
• Edge: fuzz testing timeouts, CI resource constraints, non-deterministic crashes

[OlaBakare]

@OlaBakare has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I'd love to work on this issue. I can handle this issue.
Thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OlaBakare to this issue.

[Tundeakinbami-dev]

@Tundeakinbami-dev has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

i want to work on this issue by implementing an automated fuzz testing pipeline

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Tundeakinbami-dev to this issue.