Update README badges to use default style and direct SonarCloud API

[Copilot]

Badges were using flat-square style and the SonarCloud security badge displayed "1" instead of "A" rating.

Changes

• Remove ?style=flat-square from all badge URLs (forks, stars, contributors, license, build, NuGet)
• Replace quality gate badge with direct SonarCloud API: https://sonarcloud.io/api/project_badges/measure?project=demaconsulting_ReqStream&metric=alert_status
• Replace security badge with direct SonarCloud API: https://sonarcloud.io/api/project_badges/measure?project=demaconsulting_ReqStream&metric=security_rating

The direct API badges display proper letter grades (A-E) instead of numeric ratings (1-5).

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Updated README badges</issue_title>
<issue_description>### Problem Statement

The README.md badges are flat, and the security rating is a 1 rather than an A

Proposed Solution

Remove the 'style=flat-square' from the badge images.
Update the quality-gate badge to https://sonarcloud.io/api/project_badges/measure?project=demaconsulting_ReqStream&metric=alert_status
Update the security badge to https://sonarcloud.io/api/project_badges/measure?project=demaconsulting_ReqStream&metric=security_rating

Alternatives Considered

No response

Additional Context

No response

Priority

Low - Nice to have

Contribution

• I would be willing to submit a PR for this feature

Code of Conduct

• I agree to follow this project's Code of Conduct</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: Software Quality Enforcer
Expert agent for code quality, testing standards, code reviews, security analysis, and ensuring adherence to coding conventions

• Fixes [Feature]: Updated README badges #48

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