I have analyzed the current project structure and designed a "Check-in Large Screen" (签到大屏) solution that integrates seamlessly with your existing system.

### **Plan Overview**

I will implement a **"Galaxy Spotlight"** style large screen:
1.  **Background (Danmaku/Floating Tags)**:
    -   `Business Scope` and short `Vision` keywords will float elegantly in the background like stars or drifting clouds.
    -   Uses the project's blue/cyan tech theme.

2.  **Foreground (Spotlight Card)**:
    -   A central, animated card that cycles through checked-in guests.
    -   Displays: **Company Name** (Prominent), **Guest Name/Position**, and **Vision 2026**.
    -   Updates every 8-10 seconds to ensure everyone gets exposure.

### **Implementation Steps**

#### 1. Backend (`main.py`)
-   Add a new route `/wall` to serve the large screen page.
-   Add an API `/api/wall/data` to fetch approved check-in data (filtering out empty entries).

#### 2. Frontend (`templates/wall.html`)
-   Create a new responsive HTML template.
-   **Visuals**: Reusing the `radial-gradient` background and neon aesthetics from `index.html`.
-   **Animation**:
    -   JS-based floating animation for background tags.
    -   CSS transitions for the central spotlight card.

#### 3. Admin Integration (`templates/admin.html`)
-   Add a button "Open Large Screen" (打开签到大屏) in the Admin Dashboard for easy access.

### **Technical Details**
-   **Tech Stack**: Native JS/CSS (no extra heavy libraries needed), integrated into the existing FastAPI app.
-   **Data Source**: Reads directly from `checkin_info` table.
-   **Compatibility**: Optimized for 1080p/4K displays (MacOS standard).