[hard] Refactor api-gateway route registration to reduce duplication

[davedumto]

Summary

Route registration in api-gateway repeats similar middleware wiring across many route files, violating DRY.

Requirements

• Extract a shared route registration helper for common middleware patterns
• Migrate existing routes to use the shared helper
• Verify all existing route tests pass unchanged
• Document the new registration pattern in api-gateway README

[eriifeomoniyi-hue]

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[Jumongweb]

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[Hallab7]

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I would like to work on this issue

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