Add proper error handling middleware instead of try/catch in every service method

[nanaf6203-bit]

Problem

Every service method wraps logic in try/catch blocks with ~500 lines of repetitive error handling, inconsistent messages, and missing stack traces.

Expected Outcome

Global exception filter handling all errors consistently.

Acceptance Criteria

• Create global HttpExceptionFilter
• Create PrismaExceptionFilter for database errors
• Remove redundant try/catch from service methods
• Consistent error response JSON structure

Files Affected

New: src/common/filters/, all service files

Difficulty

Medium

Estimated Effort

Medium (1 week)

Labels

refactoring, error-handling, enhancement

[ummarig]

@ummarig has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I investigated the relevant modules and have a clear strategy for implementing the required changes. Kindly assign this issue to me.

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

[drips-wave]

Congratulations, @ummarig! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @ummarig: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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[drips-wave]

This issue has been completed by @ummarig as part of the Stellar Wave Program's 7th Wave 🥳

😎 @ummarig: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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