migrate: replace Swagger with SpringDoc for OpenAPI support

[ankitshokeen]

What is the purpose of the change

This PR migrates the API documentation framework from SpringFox (Swagger 2) to SpringDoc (OpenAPI 3).
SpringFox is no longer actively maintained and causes compatibility issues with newer versions of Spring Boot, while SpringDoc is actively supported and provides better integration with modern Spring applications.

Brief changelog

• Removed SpringFox/Swagger 2 dependencies
• Added SpringDoc OpenAPI dependencies
• Updated Swagger configuration to use @OpenAPIDefinition, @Operation, etc.
• Verified API docs are accessible at /swagger-ui.html (redirects to /swagger-ui/index.html)
• Ensured compatibility with Spring Boot version 2.3.12
• Updated relevant controller annotations for OpenAPI

Verifying this change

• Run the project with mvn spring-boot:run
• Access Swagger UI at http://localhost:8080/swagger-ui.html
• Confirm that all REST endpoints are documented correctly
• Verified integration tests pass locally
• GitHub workflows remain unchanged as SpringDoc doesn't require additional build steps

XXXX

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• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist.
• Run `mvn clean compile --batch-mode -DskipTests=false -Dcheckstyle.skip=false -Drat.skip=false -Dmaven.javadoc.skip=true to make sure basic checks pass.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud