This commit introduces the initial prototype for an item database and build list tool. It establishes the foundational
structure and core features of the application.
Key components included:
- **Documentation:** Initial design, interaction, and project structure documents (`design.md`, `interaction.md`,
`outline.md`).
- **Core Pages:**
- `index.html`: Item management with CRUD operations.
- `export.html`: CSV export configuration with drag-and-drop sorting.
- `history.html`: Price history visualization with ECharts.
- **Logic:** `main.js` and page-specific scripts handle client-side logic, including data management with
`localStorage`, UI interactions, and animations.
- **Features:** Implements core functionalities such as item creation, editing, deletion, data backup/restore, and
sample data loading.
