Add integration test for holdings endpoint returning 400 for malformed Stellar address

[Chucks1093]

Summary

The wallet holdings endpoint must validate the address path param before querying the database. An integration test should confirm a malformed address returns 400 with a clear error and no database query is executed.

Scope

• Call GET /wallets/:address/holdings with several invalid address formats: too short, wrong prefix, contains invalid characters
• Assert each returns 400 with a descriptive error identifying the address field
• Assert no database query was attempted for invalid inputs

Acceptance Criteria

• Returns 400 for address that is too short
• Returns 400 for address with wrong prefix
• Returns 400 for address with invalid characters
• Error body identifies the address field in all cases

ETA: 12 hours

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Coordinate on Telegram

[Michael997glitch]

@Michael997glitch has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I’ve resolved similar problems in the past and am confident I can implement a clean, efficient fix quickly,if am given the opportunity.

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[aliyuHabibu]

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Hi, I'm a software engineer. I have gone through the issue and I can resolve it, assign it to me. Thank you

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[KingDavid9999]

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[Soumen1080]

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i would like to work this issue

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[grantfox-oss]

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Next steps:

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@KingDavid9999's PR #519 was approved and merged by @Chucks1093.

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