test: complete vitest-pool-workers migration, delete SQL-parser mock

Migrates the remaining 9 server tests to vitest-pool-workers and removes
the fragile SQL-parsing mock DB. Pure-library tests (rate-limit,
install-script, validation) and archtests stay on happy-dom — they don't
need D1 or the Workers runtime.

Migrated to pool-workers in this commit:
- src/lib/server/auth.test.ts (JWT + DB-backed getCurrentUser)
- src/routes/api/auth/cli/start/server.test.ts
- src/routes/api/auth/cli/approve/server.test.ts
- src/routes/api/configs/[slug]/server.test.ts
- src/routes/api/configs/[slug]/revisions/server.test.ts
- src/routes/[username]/[slug]/install/server.test.ts
- src/routes/[username]/[slug]/config/server.test.ts
- src/smoke-tests/{cli-auth-flow,config-crud,critical-paths}.test.ts

The CLI auth-flow smoke test now exercises the real approve endpoint
end-to-end (previously had to fake it because the mock couldn't handle
datetime expressions). The config-crud smoke test now verifies UPDATE
side effects in the DB (previously couldn't — mock didn't honor
COALESCE).

Infrastructure:
- Adds src/lib/test/call.ts helper to cut RequestEvent boilerplate
- Extends call() with params/clientAddress for routes that need them
- Deletes src/lib/test/db-mock.ts (~390 lines of SQL-parsing mock)
- Deletes src/lib/test/setup.ts (process.env shims no longer needed)
- Deletes src/lib/test/helpers.ts (unused after migration)
- Trims src/lib/test/fixtures.ts to data-only exports
- Adds @cloudflare/vitest-pool-workers/types to tsconfig.json
- Wires npm test / test:run / test:coverage to run both configs;
  adds test:happy-dom and test:workers for targeted runs

Final test layout: 181 tests on pool-workers (14 files, real D1 +
Workers runtime), 99 tests on happy-dom (6 files, pure libs +
archtests). Both green; full npm run validate clean.

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

Author: fullstackjam

package.json

@@ -10,10 +10,12 @@
 		"prepare": "svelte-kit sync || echo ''",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
-		"test": "vitest",
+		"test": "vitest run && vitest run --config vitest.workers.config.ts",
 		"test:ui": "vitest --ui",
-		"test:run": "vitest run",
-		"test:coverage": "vitest run --coverage",
+		"test:run": "vitest run && vitest run --config vitest.workers.config.ts",
+		"test:happy-dom": "vitest run",
+		"test:workers": "vitest run --config vitest.workers.config.ts",
+		"test:coverage": "vitest run --coverage && vitest run --config vitest.workers.config.ts --coverage",
 		"lint": "eslint .",
 		"lint:fix": "eslint . --fix",
 		"format": "prettier --write .",