개발자용 멀티플레이 기능 추가

Assets/Scripts/NETWORK_CONNECTION_README.md

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+# Network Connection Features
+
+This project provides multiple ways to connect to multiplayer servers by IP address, both in the editor and in standalone builds.
+
+## Features
+
+### 1. Editor Window (NetworkConnectionWindow)
+A dedicated Editor window for managing network connections with a GUI.
+
+**How to Use:**
+- Open via: `Window > Network > Connection Manager` or press `Ctrl+Shift+N` / `Cmd+Shift+N`
+- Features:
+  - Select connection mode (Host/Client/Server)
+  - Enter server IP and port
+  - Start/Stop network connections
+  - View connection status
+  - Save/load connection settings
+
+### 2. NetworkConnectionHelper Component
+A MonoBehaviour component with custom inspector for quick network control.
+
+**How to Use:**
+1. Add `NetworkConnectionHelper` component to any GameObject in your scene
+2. Configure settings in Inspector:
+   - Server IP (for client mode)
+   - Port
+   - Auto-start options
+3. Use inspector buttons to:
+   - Start Host
+   - Start Server
+   - Start Client
+   - Disconnect
+4. View real-time connection status and network info
+
+### 3. NetworkJoinUI Component
+In-game UI for connecting to servers by IP (works in both editor and standalone builds).
+
+**How to Use:**
+1. Create UI elements:
+   - InputField for IP address
+   - InputField for port
+   - Buttons: Join, Host, Disconnect
+   - Text for status display
+2. Add `NetworkJoinUI` component to a GameObject
+3. Assign UI references in Inspector
+4. Press `J` key (default) to toggle the UI panel
+5. Connect using the UI buttons
+
+### 4. AutoHost Component (Updated)
+Auto-starts as host in editor mode (configurable).
+
+**How to Use:**
+- Add `AutoHost` component to any GameObject
+- Settings:
+  - `Enable Auto Host`: Enable/disable auto-start
+  - `Only In Editor`: Only auto-start in editor (not in standalone builds)
+
+## Setup Instructions
+
+### For Editor Testing:
+
+**Option A: Using Editor Window (Recommended)**
+1. Open `Window > Network > Connection Manager`
+2. Select mode: `Host` or `Client`
+3. Enter IP/port if needed
+4. Click `Start` or `Connect`
+
+**Option B: Using NetworkConnectionHelper**
+1. Add `NetworkConnectionHelper` component to your scene
+2. Use Inspector buttons to control connections
+3. For auto-start on play, enable `Auto Start As Host`
+
+**Option C: Using AutoHost (Original Behavior)**
+1. Keep or add `AutoHost` component
+2. It will auto-start as host when playing in editor
+
+### For Standalone Builds:
+
+**Option A: Using NetworkJoinUI (In-Game UI)**
+1. Add `NetworkJoinUI` component with UI references
+2. Build and run
+3. Press `J` to open connection panel
+4. Enter IP and connect
+
+**Option B: Using NetworkConnectionHelper**
+1. Add `NetworkConnectionHelper` component
+2. Set `Auto Start As Host = true` and `Only In Editor = false`
+3. Build - it will auto-start as host
+
+## Connection Modes
+
+### Host
+- Acts as both server and client
+- Can host multiplayer games
+- Players connect to your IP
+
+### Client
+- Connects to an existing server
+- Requires server IP address
+
+### Server
+- Server-only mode (no player)
+- Used for dedicated servers
+
+## Network Info Display
+
+All connection methods display:
+- Current mode (Host/Client/Server)
+- Connection status
+- IP address and port
+- Number of connected clients
+- Local Client ID
+
+## Tips
+
+1. **Testing Multiplayer Locally:**
+   - Use `127.0.0.1` or `localhost` for local testing
+   - Or use your local IP for testing on same network
+
+2. **Default Port:**
+   - Default port is `7777`
+   - Change in any connection component's settings
+
+3. **Firewall:**
+   - Ensure port is open for network connections
+   - Windows Firewall may block connections
+
+4. **Multiple Editor Instances:**
+   - Use Unity's `ParrelSync` or run multiple standalone builds
+   - Each instance needs different settings
+
+## Integration
+
+All features integrate with existing `NetworkManager` and `NetworkConnectionHandler`:
+- Player spawning is handled automatically
+- Connection approval is handled by `NetworkConnectionHandler`
+- Compatible with existing multiplayer systems