refactor(controller): Remove unused motion control methods

- Eliminated several unused motion control methods from the controller interface and implementation, including Content, LeftFlip, BackFlip, HandStand, FreeWalk, FreeBound, FreeJump, FreeAvoid, ClassicWalk, WalkUpright, CrossStep, AutoRecoverSet, StaticWalk, TrotRun, and EconomicGait. This cleanup simplifies the code structure and improves maintainability.

include/controller.hpp

@@ -43,7 +43,6 @@ public:
     bool Hello();
     bool Stretch();
     bool SwitchJoystick(bool flag);
-    bool Content();
     bool Heart();
     bool Pose(bool flag);
     bool Scrape();
@@ -52,21 +51,6 @@ public:
     bool FrontPounce();
     bool Dance1();
     bool Dance2();
-    bool LeftFlip();
-    bool BackFlip();
-    bool HandStand(bool flag);
-    bool FreeWalk();
-    bool FreeBound(bool flag);
-    bool FreeJump(bool flag);
-    bool FreeAvoid(bool flag);
-    bool ClassicWalk(bool flag);
-    bool WalkUpright(bool flag);
-    bool CrossStep(bool flag);
-    bool AutoRecoverSet(bool flag);
-    bool StaticWalk();
-    bool TrotRun();
-    bool EconomicGait();
-    bool SwitchAvoidMode();
     bool TrajectoryFollow(const std::vector<std::array<float, 6>>& path);
     bool FootRaiseHeight(float height);