WiFi Latency - FPS Limiter

## 📶 WiFi Latency - FPS Limiter

This is a server-side and client-side utility mod that allows administrators to simulate "bad WiFi" by dynamically limiting players' FPS and displaying a network signal HUD.

## ✨ Features
*   **Admin Command:** `/wifi <player> <1~4>` (Requires OP level 3). Admin can instantly change a player's network status.
*   **FPS Limiter Tiers:**
    *   **Level 1 (Red):** 5 FPS limit
    *   **Level 2 (Orange):** 20 FPS limit
    *   **Level 3 (Yellow):** 45 FPS limit
    *   **Level 4 (Green):** Unlimited FPS
*   **Visual HUD:** A 4-bar signal indicator in the top-right corner (syncs with server). The lower the level, the more the icon shakes and turns red.
*   **Audio & Chat Feedback:** Plays UI click sounds and sends Actionbar/System messages when a player's network level changes.
*   **JSON Persistence:** Player levels are saved in `world/wifi_data.json`. Levels are automatically restored when a player rejoins.

## ⚙️ Installation & Requirements
*   **Mod Loader:** Fabric
*   **Fabric Loader:** 0.19.3 or higher
*   **Fabric API:** Required

### 🖥️ Server-Side vs. Client-Side
*   **Server-Side Only:** The commands, chat messages, and sounds will work. However, the server *cannot* force a vanilla client to drop frames. The actual FPS limiting will not happen.
*   **Server + Client Side (Recommended):** Players must install the mod on their clients. They will see the HUD signal bars, and their game will *actually* drop to the specified FPS limit based on their assigned level.

*(Note: If a player has their maximum FPS set lower than the mod's limit, or has VSync enabled, the mod will respect their vanilla settings.)*