Phase 3 follow-up: type-check + tests grün, ts-fsrs v5 API

- tsconfig.base.json: allowImportingTsExtensions + noEmit (.ts-Imports
  in dev, kein tsc-Output, vitest/bun/vite handhaben Build)
- ts-fsrs v5.3.2 API-Updates:
  - scheduler.next(card, now, grade) statt repeat(card, now)[rating].card
  - Grade-Type für RATING_TO_FSRS (excluded Manual)
  - learning_steps-Feld auf Review (Schema, Drizzle-Column, Adapter,
    DTO-Konverter, Tests)
- apps/web: extends .svelte-kit/tsconfig.json (SvelteKit-Empfehlung),
  test-Script mit --passWithNoTests
- apps/api: dropped types: ['bun-types'] (stale)
- pnpm-lock.yaml committed

Status:
- pnpm run type-check ✅ 4/4 packages grün (api, domain, web mit
  svelte-check 0 errors)
- pnpm run test ✅ 46 Tests grün (cards-domain: 27, apps/api: 19,
  apps/web: --passWithNoTests)
- pnpm install ✅ 136 packages, 8s

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

apps/web/package.json

@@ -10,7 +10,7 @@
 		"preview": "vite preview",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"type-check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
-		"test": "vitest run",
+		"test": "vitest run --passWithNoTests",
 		"lint": "echo 'lint configured later (eslint flat-config)'",
 		"clean": "rm -rf .svelte-kit build .turbo"
 	},