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).

dist_ts/security/index.js

@@ -1,4 +1,5 @@
 export { SecurityLogger, SecurityLogLevel, SecurityEventType } from './classes.securitylogger.js';
 export { IPReputationChecker, ReputationThreshold, IPType } from './classes.ipreputationchecker.js';
 export { ContentScanner, ThreatCategory } from './classes.contentscanner.js';
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+export { RustSecurityBridge, } from './classes.rustsecuritybridge.js';
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