Preserve raw HTTP body whitespace in HTTPTarget

[biefan]

Summary

• preserve raw request body whitespace in HTTPTarget.parse_raw_http_request()
• avoid trimming trailing spaces or newlines from text/plain and other non-JSON bodies
• add regression coverage for raw request bodies with trailing whitespace

Problem

HTTPTarget.parse_raw_http_request() currently calls strip() on the full raw HTTP request before splitting headers from the body.

That means body content is not preserved exactly as provided. For example, a raw request body such as:

hello  

is parsed as:

hello

This silently rewrites non-JSON request bodies and can break plain text, form data, or any scenario where trailing whitespace is significant.

Testing

• .venv/bin/pytest tests/unit/target/test_http_target_parsing.py -q