test: add vitest + pg-mem test infrastructure

[viganogabriele]

Summary

• Adds a test harness with no real DB/secrets required: vitest + pg-mem (in-memory Postgres), test/test:watch scripts, and vitest.config.ts (aliases @ -> ./src, sets SKIP_ENV_VALIDATION so importing modules doesn't require env config and db.ts's startup init is skipped).
• Adds the first test suite (src/lib/url-service.test.ts) covering existing UrlService behavior (create with random/custom code, duplicate rejection, lookup, update, delete, click count, pagination/search/sort) by mocking @/lib/db's getPool with a pg-mem-backed pool — no production code changed.

This is pure test infrastructure, ported/adapted from the same pattern used in vigab.cc (a fork of this project), and is a prerequisite for adding tests alongside upcoming features (tags, analytics, aliases).

Test plan

• pnpm test — 7 tests pass
• pnpm check (biome) passes
• pnpm build succeeds

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 8fb680c and 2e21278.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (3)

• package.json
• src/lib/url-service.test.ts
• vitest.config.ts

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