feat: start checks

rust/src/model/misc.rs

@@ -1,4 +1,5 @@
 use serde::{Deserialize, Serialize};
+use crate::pkg::PkgKey;
 
 #[derive(Clone, Serialize, Deserialize, Debug, PartialEq)]
 pub enum Game {
@@ -26,3 +27,11 @@ impl std::fmt::Display for Game {
         }
     }
 }
+
+#[derive(Serialize, Deserialize)]
+pub enum StartCheckError {
+    MissingRemotePackage(PkgKey),
+    MissingLocalPackage(PkgKey),
+    MissingDependency(PkgKey, PkgKey),
+    MissingTool(PkgKey),
+}