feat(wits): 添加WITS数据验证和字段规则配置

- 在model.__init__.py中新增REQUIRED_SIMPLIFIED_FIELD_RULES和REQUIRED_TRANSMISSION_CHANNELS导出
- 移除app/mqtt_sender.py中的MQTT发送功能，禁用相关逻辑
- 在model/wits.py中添加WITS字段验证规则和传输通道映射配置
- 实现validate_required_wits_fields函数进行必填字段验证
- 在WitsData类中添加__post_init__方法执行字段验证
- 为wits_sender.py添加传输值验证和数据包验证功能
- 更新随机WITS数据生成逻辑，使用真实钻井参数范围
- 实现数据包解析和验证功能，确保必传字段完整性

model/__init__.py

@@ -1,6 +1,6 @@
 from model.config import AppConfig, MqttConfig, TdengineConfig, TmsConfig, WitsConfig
 from model.drilling import DrillingRealtimeData
-from model.wits import WITS_CHANNEL_MAPPING, WitsData
+from model.wits import REQUIRED_SIMPLIFIED_FIELD_RULES, REQUIRED_TRANSMISSION_CHANNELS, WITS_CHANNEL_MAPPING, WitsData
 
 # Backward-compatible alias for older imports.
 WITS_FIELD_MAPPING = WITS_CHANNEL_MAPPING
@@ -11,6 +11,8 @@ __all__ = [
     "MqttConfig",
     "TdengineConfig",
     "TmsConfig",
+    "REQUIRED_SIMPLIFIED_FIELD_RULES",
+    "REQUIRED_TRANSMISSION_CHANNELS",
     "WITS_CHANNEL_MAPPING",
     "WITS_FIELD_MAPPING",
     "WitsConfig",