init event notifer

crates/event-notifier/src/error.rs

@@ -0,0 +1,25 @@
+// src/error.rs
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("target not found: {0}")]
+    TargetNotFound(String),
+
+    #[error("send failed: {0}")]
+    SendError(String),
+
+    #[error("target error: {0}")]
+    TargetError(String),
+
+    #[error("invalid configuration: {0}")]
+    ConfigError(String),
+
+    #[error("store error: {0}")]
+    StoreError(String),
+
+    #[error("invalid event name: {0}")]
+    InvalidEventName(String), // 添加此变体
+}
+
+pub type Result<T> = std::result::Result<T, Error>;