Implement proper UWB initialization and fix range data parsing

- Replace high-level UWBHelper calls with direct AT command sequence
- Add hardware reset on every startup for reliable operation
- Implement proper timing delays between AT commands
- Add configuration verification with AT+GETCFG
- Complete rewrite of parseRangeData to handle multiple devices correctly
- Fix anchor/tag behavior: anchors only show tags, tags show all anchors
- Add isAnchor parameter to parseRangeData for device-specific logic
- Maintain backward compatibility with default parameter values

lib/UWBHelper/UWBHelper.h

@@ -63,7 +63,7 @@ public:
     String getReporting();                              // AT+GETRPT?
     
     // Range Command (3.15)
-    bool parseRangeData(String data, DeviceData devices[], int maxDevices);
+    bool parseRangeData(String data, DeviceData devices[], int maxDevices, bool isAnchor = true);
     bool parseDetailedRangeData(String data, RangeResult* result);
     
     // Sleep Command (3.16)