fix(rust-bridge): correct Email.addHeader() calls and IBounceDetection interface

Use addHeader() instead of non-existent setHeader() for security
result headers, and align IBounceDetection with actual Rust struct
fields (bounce_type + category only).

ts/security/classes.rustsecuritybridge.ts

@@ -46,11 +46,7 @@ interface IValidationResult {
 
 interface IBounceDetection {
   bounce_type: string;
-  severity: string;
   category: string;
-  should_retry: boolean;
-  recommended_action: string;
-  details: string;
 }
 
 interface IReputationResult {