chore: 官网拆分 homepage + 关于页瘦身 + 端口 5175（当前可用状态基线）

src-tauri/src/domain/error.rs

@@ -9,3 +9,33 @@ pub mod codes {
     pub const KNOWN_HOSTS_PATH: &str = "native.knownHostsPath";
     pub const INVALID_HOST_KEY_DECISION: &str = "native.invalidHostKeyDecision";
 }
+
+/// Domain failures retain their cause while exposing stable IPC codes where available.
+#[derive(Debug, thiserror::Error)]
+pub enum AppError {
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error(transparent)]
+    InvalidBase64(#[from] base64::DecodeError),
+    #[error("{0}")]
+    TaskJoin(String),
+}
+
+impl AppError {
+    pub fn code(&self) -> Option<&'static str> {
+        match self {
+            Self::Io(_) => None,
+            Self::InvalidBase64(_) => Some(codes::INVALID_BASE64),
+            Self::TaskJoin(_) => Some(codes::TASK_JOIN),
+        }
+    }
+}
+
+impl From<AppError> for crate::domain::ssh::OperationResponse {
+    fn from(error: AppError) -> Self {
+        match error.code() {
+            Some(code) => Self::coded(code, error.to_string()),
+            None => Self::error(error.to_string()),
+        }
+    }
+}