Add integration test for wallet activity feed returning 400 for malformed Stellar address

[Chucks1093]

Summary

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

Scope

• Call GET /wallets/:address/activity with an invalid Stellar address format
• Assert response is 400 with a field-level error identifying address
• Repeat for: wrong prefix, too short, invalid characters

Acceptance Criteria

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

ETA: 12 hours

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Coordinate on Telegram

[Georgechisom]

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

Hello, i have reviewed this serve issue and i have got the experience and skill to solve it, kindly assign it to me

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[Oluwasuyi-Timilehin]

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

Hello, please assign this to me. I would get started immediately

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[NEA-DEV-coder]

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

Hi maintainer, kindly assign me this issue.

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