test(dashboard): satisfy server.ts contract on sandbox-audit MockStore

routes-sandbox-audit.test.ts mocked @fusion/core without
deterministicGuardLocks (causing the workflow-routes import to throw)
and its MockStore lacked getDatabase, which createServer now calls
when wiring ChatStore. Add both. Fixes 3 failing tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/src/__tests__/routes-sandbox-audit.test.ts

@@ -12,6 +12,7 @@ vi.mock("@fusion/core", () => ({
   ChatStore: class MockChatStore {
     init = vi.fn().mockResolvedValue(undefined);
   },
+  deterministicGuardLocks: new Map(),
 }));
 
 vi.mock("../project-store-resolver.js", () => ({
@@ -28,6 +29,16 @@ class MockStore {
   getFusionDir() {
     return "/tmp/fn-4640-test/.fusion";
   }
+  getDatabase() {
+    return {
+      exec: vi.fn(),
+      prepare: vi.fn().mockReturnValue({
+        run: vi.fn().mockReturnValue({ changes: 0 }),
+        get: vi.fn(),
+        all: vi.fn().mockReturnValue([]),
+      }),
+    };
+  }
 }
 
 function mockRun() {