test: add comprehensive automated test coverage

- Vitest multi-project setup (unit / integration / component)
- Real-Postgres integration harness via in-process PGlite (TEST_DATABASE_URL
  override), migrations applied per worker; production code untouched
- Unit: routing, locale, validation/Zod schemas, metadata, mail, site-theme,
  marquee, media, portfolio helpers, plus architecture-rule tests
- Integration: Prisma data layer, API routes, and all server actions
- Component: UI primitives and form components (jsdom + Testing Library)
- 371 tests passing

tests/portfolio-storage.test.ts

@@ -10,6 +10,7 @@ import {
   resolveMediaUploadPath,
   sanitizeBaseName,
 } from "../lib/media-storage";
+import { canManageUploads } from "./helpers/fs-capability";
 
 const createdFiles: string[] = [];
 
@@ -39,7 +40,7 @@ describe("media storage helpers", () => {
     expect(resolvedPath.endsWith(path.join("assets", "test.svg"))).toBe(true);
   });
 
-  it("removes a managed file from disk", async () => {
+  it.skipIf(!canManageUploads)("removes a managed file from disk", async () => {
     const relativePath = `/uploads/media/tests/${Date.now()}-temp.txt`;
     const absolutePath = resolveMediaUploadPath(relativePath);