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/tsconfig.json

@@ -1,21 +1,12 @@
 {
-	"extends": "../../tsconfig.base.json",
+	"extends": "./.svelte-kit/tsconfig.json",
 	"compilerOptions": {
+		"strict": true,
 		"allowJs": true,
 		"checkJs": true,
 		"sourceMap": true,
-		"strict": true,
-		"moduleResolution": "bundler"
-	},
-	"include": [
-		".svelte-kit/ambient.d.ts",
-		".svelte-kit/non-ambient.d.ts",
-		".svelte-kit/types/**/$types.d.ts",
-		"vite.config.ts",
-		"src/**/*.js",
-		"src/**/*.ts",
-		"src/**/*.svelte",
-		"tests/**/*"
-	],
-	"exclude": ["node_modules", ".svelte-kit/output", "build"]
+		"moduleResolution": "bundler",
+		"allowImportingTsExtensions": true,
+		"noEmit": true
+	}
 }