Initial scaffold: Rust server workspace (sb-api, sb-core, sb-db, sb-auth, sb-shared) + sb-common dependency + systemd

crates/sb-shared/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "sb-shared"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"

crates/sb-shared/src/errors.rs

@@ -0,0 +1,15 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AppError {
+    pub code: String,
+    pub message: String,
+}
+
+impl std::fmt::Display for AppError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}: {}", self.code, self.message)
+    }
+}
+
+impl std::error::Error for AppError {}

crates/sb-shared/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod errors;
+
+pub use errors::AppError;