修正示例中的三轴力单位显示

避免未标定读数被示例标成 N，并让 Finger 示例读取 SDK 的每轴单位。已通过相关测试和语法检查。

examples/basic_pipeline.py

@@ -77,13 +77,13 @@ def main() -> int:
                     break
 
                 # ------------------------------------------------------ use the results
-                # Scalars are calibrated Newtons when the bundle ships a calibration; the *_raw
-                # pair is always the unfiltered integrator output.
+                # The *_raw pair is always the unfiltered integrator output.
                 touching = "yes" if snap.centroid is not None else "no"
+                fn_unit, fx_unit, fy_unit = sensor.force_units
                 print(
                     f"FPS={snap.fps:5.1f}  "
-                    f"normal={snap.normal_force:8.4f} N (raw {snap.normal_force_raw:10.2f})  "
-                    f"shear=({snap.shear_x:7.4f}, {snap.shear_y:7.4f})  "
+                    f"normal={snap.normal_force:8.4f} {fn_unit} (raw {snap.normal_force_raw:10.2f})  "
+                    f"shear=({snap.shear_x:7.4f} {fx_unit}, {snap.shear_y:7.4f} {fy_unit})  "
                     f"contact={touching}  age={snap.age_ms:4.1f} ms",
                     end="\r",
                 )