Add typed modloader variants to ecosystem-schema model

This is done so to better handle the mapping of modloader variants to
specific package installers. We do so via enum as any modification of
these variants will incur a compilation error that must be handled.

Author: ethangreen-dev

src/ts/v1/models/ecosystem.rs

@@ -123,7 +123,23 @@ pub struct GameDefR2MM {
 pub struct R2MMModLoaderPackage {
     pub package_id: String,
     pub root_folder: String,
-    pub loader: String,
+    pub loader: R2MLLoader,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "lowercase")]
+pub enum R2MLLoader {
+    BepInEx,
+    GDWeave,
+    GodotML,
+    Lovely,
+    MelonLoader,
+    Northstar,
+    #[serde(rename = "recursive-melonloader")]
+    RecursiveMelonLoader,
+    #[serde(rename = "return-of-modding")]
+    ReturnOfModding,
+    Shimloader,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone)]