feat(security): migrate content scanning and bounce detection to Rust security bridge; add scanContent IPC command and Rust content scanner with tests; update TS RustSecurityBridge and callers, and adjust CI package references

rust/crates/mailer-bin/src/main.rs

@@ -1,4 +1,4 @@
-//! mailer-bin: CLI and IPC binary for the @serve.zone/mailer Rust crates.
+//! mailer-bin: CLI and IPC binary for the @push.rocks/smartmta Rust crates.
 //!
 //! Supports two modes:
 //! 1. **CLI mode** — traditional subcommands for testing and standalone use
@@ -560,6 +560,25 @@ async fn handle_ipc_request(req: &IpcRequest) -> IpcResponse {
             }
         }
 
+        "scanContent" => {
+            let subject = req.params.get("subject").and_then(|v| v.as_str());
+            let text_body = req.params.get("textBody").and_then(|v| v.as_str());
+            let html_body = req.params.get("htmlBody").and_then(|v| v.as_str());
+            let attachment_names: Vec<String> = req.params.get("attachmentNames")
+                .and_then(|v| v.as_array())
+                .map(|a| a.iter().filter_map(|v| v.as_str().map(String::from)).collect())
+                .unwrap_or_default();
+            let result = mailer_security::content_scanner::scan_content(
+                subject, text_body, html_body, &attachment_names
+            );
+            IpcResponse {
+                id: req.id.clone(),
+                success: true,
+                result: Some(serde_json::to_value(&result).unwrap()),
+                error: None,
+            }
+        }
+
         "checkSpf" => {
             let ip_str = req.params.get("ip").and_then(|v| v.as_str()).unwrap_or("");
             let helo = req