feat(auth): add logout functionality

- Implement LogoutHandler to handle user logout requests
- Add DeleteTokenInfo and GetUserIDFromToken functions to auth module
- Update README.md with logout endpoint documentation

README.md

@@ -77,7 +77,7 @@ All API responses are returned in JSON format:
 
 ---
 
-### 1. Register User
+### Register User
 
 **Endpoint:** `/register`  
 **Method:** POST  
@@ -122,7 +122,7 @@ X-Timestamp: 1704067200000
 
 ---
 
-### 2. Login
+### Login
 
 **Endpoint:** `/login`  
 **Method:** POST  
@@ -166,7 +166,33 @@ X-Timestamp: 1704067200000
 
 ---
 
-### 3. Create frpc Instance
+### Logout
+
+**Endpoint:** `/logout`  
+**Method:** GET  
+**Auth Required:** Yes (token)
+
+**Request Headers:**
+```
+X-Token: your_token
+X-Timestamp: 1704067200000
+```
+| Header | Type | Required | Description |
+|--------|------|----------|-------------|
+| X-Token | string | Yes | Authentication token |
+| X-Timestamp | int64 | Yes | Client timestamp in milliseconds |
+
+**Response:**
+```json
+{
+  "success": true,
+  "message": "Logout successful"
+}
+```
+
+---
+
+### Create frpc Instance
 
 **Endpoint:** `/frpcAct/instanceMgr/create`  
 **Method:** POST  
@@ -226,7 +252,7 @@ X-Timestamp: 1704067200000
 
 ---
 
-### 4. Delete frpc Instance
+### Delete frpc Instance
 
 **Endpoint:** `/frpcAct/instanceMgr/delete`  
 **Method:** POST  
@@ -259,7 +285,7 @@ X-Timestamp: 1704067200000
 
 ---
 
-### 5. Modify frpc Instance
+### Modify frpc Instance
 
 **Endpoint:** `/frpcAct/instanceMgr/modify`  
 **Method:** POST  
@@ -384,7 +410,7 @@ Modify system-level settings such as instance name, boot-at-start configuration,
 
 ---
 
-### 6. List frpc Instances
+### List frpc Instances
 
 **Endpoint:** `/frpcAct/instanceMgr/list`  
 **Method:** GET