Refactor: Migrate unwrap calls to AppError in MCP handlers

server/src/error.rs

@@ -103,3 +103,15 @@ mod tests {
         assert_eq!(err.to_string(), "Bad Request: test");
     }
 }
+
+impl From<String> for AppError {
+    fn from(msg: String) -> Self {
+        AppError::Internal(msg)
+    }
+}
+
+impl From<&str> for AppError {
+    fn from(msg: &str) -> Self {
+        AppError::Internal(msg.to_string())
+    }
+}