Refactor API documentation to use OpenAPI 3.1 with automated SDK generation

[Smartdevs17]

Context

API documentation is manual and out of sync with implementation.

Current Limitation

OpenAPI spec is maintained separately from code.

Expected Outcome

• Code-first OpenAPI generation
• Automated SDK generation from spec
• Interactive API explorer
• Version management

Acceptance Criteria

• OpenAPI 3.1 spec generated from route decorators
• Automated TypeScript SDK generation
• Interactive Swagger UI with authentication
• API versioning strategy (URL vs header)
• Breaking change detection in CI
• SDK publishing to npm
• API changelog generation

Technical Scope

• backend/src/routes/ - Route definitions
• backend/docs/openapi.json - API specification
• packages/sdk/ - Generated SDK
• .github/workflows/ - SDK generation CI

[Muyideen-js]

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Hi! I'm a full-stack developer with TypeScript and Stellar ecosystem experience. I've reviewed this issue and can deliver a quality fix. Please assign this to me!

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[veloura-dev]

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Please maintainer..I can handle this professionally and make sure this issue is closed ASAP WITHOUT ERRORS.

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[Wilfred007]

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Can I work on this task?

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[Michealshodipo56]

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kindly assign me to this issue

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[drips-wave]

This issue has been completed by @Wilfred007 as part of the Stellar Wave Program's 7th Wave 🥳

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