Initial commit: AI-driven visual novel scaffold

- Monorepo (pnpm workspace): apps/web + packages/{types,ai-client,engine}
- Next.js 16 web app with three-stage AI orchestration
- Three independently configurable providers: text LLM, image generator, vision model
- Warm minimalist editorial UI design
- One-click Vercel deploy ready

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

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "dada",
+  "version": "0.1.0",
+  "private": true,
+  "description": "AI-driven visual novel — open source",
+  "license": "MIT",
+  "packageManager": "pnpm@9.12.0",
+  "engines": {
+    "node": ">=20"
+  },
+  "scripts": {
+    "dev": "pnpm --filter @dada/web dev",
+    "build": "pnpm --filter @dada/web build",
+    "start": "pnpm --filter @dada/web start",
+    "lint": "pnpm -r lint",
+    "typecheck": "pnpm -r typecheck"
+  },
+  "devDependencies": {
+    "typescript": "^5.6.3"
+  }
+}