refactor(frontend,plugins): normalise les DTOs review backend et corrige le mock (#120)

- plugin.ts: normalizeReview() garantit issues/installable définis même si backend omet ces champs
- mock/index.ts: MockPluginGateway.uninstall() retourne removalOutcome pour cohérence avec le domaine
- domain/index.ts: PluginUninstallResult ajoute removalOutcome optionnel
- Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/adapters/plugin.test.ts

@@ -23,4 +23,28 @@ describe("TauriPluginGateway invoke payloads", () => {
       },
     });
   });
+
+  it("normalizes backend review DTOs for the Plugins panel view-model", async () => {
+    invoke.mockResolvedValueOnce({
+      id: "dev.acme.gitgraph",
+      displayName: "Git Graph",
+      publisher: "Acme",
+      version: "1.2.3",
+      description: "Graph",
+      sourceKind: "archive",
+      sourceLabel: "/tmp/gitgraph.ideaplug",
+      contentHash: "abc",
+      trustLevel: "full",
+      contributionSummary: { topLevelMenus: 1, menuItems: 2, layouts: 3, mcpServers: 4 },
+      contributes: { menus: [], menuItems: [], layouts: [], mcpServers: [] },
+    });
+
+    const review = await new TauriPluginGateway().reviewPackage({
+      sourceKind: "archive",
+      path: "/tmp/gitgraph.ideaplug",
+    });
+
+    expect(review.issues).toEqual([]);
+    expect(review.installable).toBe(true);
+  });
 });