feat: 添加多个功能模块和工具脚本

- 新增websocket客户端和服务端实现
- 添加图片压缩工具和快速压缩脚本
- 实现学生信息处理相关API
- 添加MQTT客户端和消息处理功能
- 更新.gitignore忽略更多文件类型
- 添加数据库操作工具和示例
- 实现多个测试脚本和工具类

智慧校园/同文/班牌机mqtt_client.py

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+import paho.mqtt.client as mqtt
+import json
+import time
+import datetime
+
+# MQTT 配置
+# BROKER = "100.68.18.111"  # 与发送端相同
+BROKER = "band.hxzhxy.cn"  # 与发
+PORT = 1883
+TOPICs = ["cmd/publicizeBanpai/#","upload/publicizeBanpai/#","common/publicizeBanpai/#"]  # 与发送端相同
+CLIENT_ID = "python-mqtt-receiver"
+
+
+# 收到消息时的回调
+def on_message(client, userdata, msg):
+    try:
+        payload = msg.payload.decode()
+        mac = msg.topic.split("/")[2]
+        print("\n" + "=" * 50)
+        print(f"收到新消息 [QoS: {msg.qos}]")
+        print(f"客户端 ID: {mac}")
+        print(f"主题: {msg.topic}")
+        if "message" in msg.topic:
+            
+            data = json.loads(json.loads(payload)["data"])
+            ip = data["ip"]
+            mac = data["mac"]
+            print(ip,mac)
+        print(f"时间: {time.strftime('%Y-%m-%d %H:%M:%S')}")
+        print("内容:")
+        print(payload)
+        if "systeminfo" in msg.topic:
+            with open("mqtt_systeminfo.txt", "a+") as f:
+                f.write(f"{time.strftime('%Y-%m-%d %H:%M:%S')}\n")
+                f.write(f"客户端 ID: {mac}\n")
+                f.write(f"\n")
+    except Exception as e:
+        print(f"消息解析错误: {e}")
+
+
+# 创建客户端
+client = mqtt.Client(CLIENT_ID)
+client.on_message = on_message
+
+# 连接并订阅
+print(f"连接到 MQTT 代理: {BROKER}:{PORT}")
+client.connect(BROKER, PORT)
+for topic in TOPICs:
+    client.subscribe(topic)
+print(f"已订阅主题: {TOPICs}")
+print("等待消息... (按 Ctrl+C 退出)")
+
+# 保持连接
+try:
+    client.loop_forever()
+except KeyboardInterrupt:
+    print("\n断开连接...")
+    client.disconnect()