feat(plugins,host): pluginRoot officiel transmis au contexte activate(ctx) des plugins — #285 (domain ports + infrastructure plugin: racine du package installé résolue depuis la même source de vérité que la substitution manifest ${pluginRoot}; application runtime_catalog + slash_command; backend dto + app-tauri dto_plugins; frontend domain + plugins runtime loader transmettent pluginRoot au contexte activé; bump pointeur IdeaSDK e3a0f46 via feature/285-plugin-root-runtime-api; QA verte: cargo check domain/application/infrastructure/backend/app-tauri, runtime_catalog 5/5, plugin_install_load 5/5, dto_plugins 2/2, frontend typecheck + 33 tests/3 fichiers, cargo fmt --check, git diff --check; réserves: rebuild AppImage + validation live ctx.pluginRoot dans le binaire actif restants)

crates/application/src/plugin/mod.rs

@@ -184,6 +184,8 @@ pub struct PluginRuntimePlugin {
     pub version: String,
     /// Bundle URL.
     pub bundle_url: String,
+    /// Canonical host-local root of the installed plugin package.
+    pub plugin_root: String,
     /// Icon URL.
     pub icon_url: Option<String>,
     /// Content hash.
@@ -3022,6 +3024,10 @@ pub(crate) async fn runtime_plugin_from_entry(
         &descriptor.registry.content_hash,
         &descriptor.manifest.main,
     )?;
+    let plugin_root = packages
+        .installed_plugin_root(&descriptor.manifest.id)
+        .await
+        .map_err(map_store)?;
     let icon_url = match &descriptor.manifest.icon {
         Some(icon) => Some(checked_plugin_asset_url(
             packages,
@@ -3038,6 +3044,7 @@ pub(crate) async fn runtime_plugin_from_entry(
         publisher: descriptor.manifest.publisher,
         version: descriptor.manifest.version.as_str().to_owned(),
         bundle_url: bundle,
+        plugin_root: plugin_root.as_str().to_owned(),
         icon_url,
         content_hash: descriptor.registry.content_hash.as_str().to_owned(),
         capabilities: descriptor.manifest.capabilities,
@@ -4203,6 +4210,10 @@ mod tests {
         let catalog = usecase.execute().await.unwrap();
 
         assert_eq!(catalog.plugins.len(), 1);
+        assert_eq!(
+            catalog.plugins[0].plugin_root,
+            "/installed/dev.acme.gitgraph"
+        );
         assert_eq!(
             catalog.plugins[0].capabilities,
             vec![