test: add 100% coverage for apps/api and packages/types

Adds full Vitest test suites with @vitest/coverage-v8, targeting 100%
statement/branch/function/line coverage. Uses v8 ignore comments for
genuinely unreachable defensive branches.

packages/types/vitest.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: "v8",
+      include: [
+        "src/interfaces/Companion.ts",
+        "src/interfaces/EquipmentSet.ts",
+        "src/interfaces/ProfileSettings.ts",
+        "src/interfaces/Story.ts",
+      ],
+      exclude: [],
+      thresholds: {
+        statements: 100,
+        branches: 100,
+        functions: 100,
+        lines: 100,
+      },
+    },
+    include: ["test/**/*.spec.ts"],
+  },
+});