Accounting System
Accounting workspace
Personal finance operations
以帳本為核心的記帳與報表工作台
管理帳本、帳戶、分類、交易與月報表。前端只透過 API 操作資料，Firestore 存取集中在後端。
Web workspace
Next.js App Router, Tailwind CSS, shadcn/ui
API boundary
Fastify API on port 8080
Protected data
Frontend talks to Firestore only through Fastify routes