fix: improve request/response capture and compare safety

[georgidhristov]

Summary

Fixes #38 by displaying captured exception details in the Response Body UI when responses are empty.

This PR also improves request/response capture safety, compare validation, payload handling, and internal project organization.

Changes

• Fix captured exception response display for empty error responses
• Add bounded response body capture stream
• Add configurable max body capture size
• Add local compare target support option
• Improve request/response body capture safety
• Improve large payload handling
• Improve compare URL validation
• Redact sensitive request headers
• Improve non-text/binary response handling
• Refactor internal project structure
• Reorganize embedded assets
• Clean up embedded resource loading
• Improve payload type badge handling for truncated bodies

New Options

public int MaxBodyCaptureSizeKb { get; set; } = 256;

public bool AllowLocalCompareTargets { get; set; }