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>

.gitignore

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+node_modules
+.pnpm-store
+.next
+dist
+build
+out
+*.tsbuildinfo
+
+.env
+.env.local
+.env.*.local
+
+.vercel
+.turbo
+
+.DS_Store
+*.log
+npm-debug.log*
+pnpm-debug.log*
+
+repomix-output.xml