CVE-2026-41508: Coraza: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling
## Root Cause File: `internal/bodyprocessors/multipart.go` (since commit `3347961b`, PR #1453 *"feat: ignore unexpected EOF in MIME multipart request body processor"*, merged 2026-03-06, first shipped in `v3.4.0`)....