Add CLAUDE.md project guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

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+# WealthySmart
+
+Personal finance management web app.
+
+## Stack
+
+- **Frontend:** React 19 + Vite + TypeScript + Tailwind CSS 4
+- **Package manager:** pnpm
+
+## Development
+
+```bash
+cd frontend && pnpm install && pnpm run dev
+```
+
+## Deployment
+
+- Deployed via Gitea Actions (self-hosted runner on VPS)
+- Push to `main` triggers: GitHub → webhook → Gitea mirror sync → Actions workflow → Docker build & deploy
+- Domain: wealthy.cescalante.dev
+- Reverse proxy: nginx-proxy + acme-companion (auto TLS)