Add Interactive API Documentation

## Description\nImplement interactive API documentation with sample requests/responses.\n\n**Acceptance Criteria:**\n- Support for OpenAPI/Swagger\n- Example payloads for all endpoints\n- Try-it-out functionality\n- Authentication integration

No files, tests, or entry points are identified. Start by locating the existing API endpoint definitions and authentication setup, then determine how OpenAPI/Swagger can represent every endpoint and its example payloads; done means interactive documentation supports try-it-out requests and authentication integration.

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