Replace PID with proportional steering, asymmetric servo limits 1.20~1.80ms, center 1.50ms

control/servo.hpp

@@ -1,12 +1,9 @@
 #pragma once
 #include "types.hpp"
-#include "control/pid.hpp"
 
 void servo_init();
 void servo_set_angle(float deviation);
 void servo_center();
 void servo_set_deadband(float v);
 void servo_set_steer_gain(float v);
-void servo_set_pid(double kp, double ki, double kd);
-
-inline float servo_get_duty_ns() { return SERVO_CENTER_NS; }
+void servo_set_pid(double kp, double ki, double kd);  // 保留兼容, 空实现