feat(character): 实现角色状态机与输入路由系统

新增角色状态机框架，包含空闲、移动、跳跃、攻击等状态
添加输入路由组件，统一处理键盘和手柄输入
引入动作库管理角色动作定义，支持PVF脚本配置
重构角色对象，整合运动器、状态机和输入处理
修复Actor子节点排序时的迭代安全问题

Game/src/character/CharacterInputRouter.cpp

@@ -0,0 +1,142 @@
+#include "character/CharacterInputRouter.h"
+#include <SDL2/SDL_gamecontroller.h>
+#include <cmath>
+
+namespace frostbite2D {
+namespace {
+
+float applyDeadZone(float value, float deadZone) {
+  return std::fabs(value) >= deadZone ? value : 0.0f;
+}
+
+} // namespace
+
+bool CharacterInputRouter::OnKeyDown(const KeyEvent& event) {
+  switch (event.getKeyCode()) {
+    case KeyCode::a:
+    case KeyCode::Left:
+      left_ = true;
+      return true;
+    case KeyCode::d:
+    case KeyCode::Right:
+      right_ = true;
+      return true;
+    case KeyCode::w:
+    case KeyCode::Up:
+      up_ = true;
+      return true;
+    case KeyCode::s:
+    case KeyCode::Down:
+      down_ = true;
+      return true;
+    case KeyCode::j:
+      attackPressed_ = true;
+      return true;
+    case KeyCode::k:
+      jumpPressed_ = true;
+      return true;
+    case KeyCode::l:
+      skill1Pressed_ = true;
+      return true;
+    case KeyCode::LShift:
+      dashPressed_ = true;
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool CharacterInputRouter::OnKeyUp(KeyCode keyCode) {
+  switch (keyCode) {
+    case KeyCode::a:
+    case KeyCode::Left:
+      left_ = false;
+      return true;
+    case KeyCode::d:
+    case KeyCode::Right:
+      right_ = false;
+      return true;
+    case KeyCode::w:
+    case KeyCode::Up:
+      up_ = false;
+      return true;
+    case KeyCode::s:
+    case KeyCode::Down:
+      down_ = false;
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool CharacterInputRouter::OnJoystickAxis(const JoystickAxisEvent& event) {
+  if (event.getAxis() == SDL_CONTROLLER_AXIS_LEFTX) {
+    leftStickX_ = applyDeadZone(event.getNormalizedValue(), joystickDeadZone_);
+    return true;
+  }
+  if (event.getAxis() == SDL_CONTROLLER_AXIS_LEFTY) {
+    leftStickY_ = applyDeadZone(event.getNormalizedValue(), joystickDeadZone_);
+    return true;
+  }
+  return false;
+}
+
+bool CharacterInputRouter::OnJoystickButtonDown(
+    const JoystickButtonDownEvent& event) {
+  switch (event.getButton()) {
+    case SDL_CONTROLLER_BUTTON_A:
+      jumpPressed_ = true;
+      return true;
+    case SDL_CONTROLLER_BUTTON_X:
+      attackPressed_ = true;
+      return true;
+    case SDL_CONTROLLER_BUTTON_B:
+    case SDL_CONTROLLER_BUTTON_RIGHTSHOULDER:
+      skill1Pressed_ = true;
+      return true;
+    case SDL_CONTROLLER_BUTTON_LEFTSHOULDER:
+      dashPressed_ = true;
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool CharacterInputRouter::OnJoystickButtonUp(
+    const JoystickButtonUpEvent& event) {
+  (void)event;
+  return false;
+}
+
+void CharacterInputRouter::EmitCommands(CharacterCommandBuffer& commandBuffer) {
+  Vec2 moveAxis(leftStickX_, leftStickY_);
+  if (moveAxis.lengthSquared() < 0.0001f) {
+    moveAxis.x = (right_ ? 1.0f : 0.0f) - (left_ ? 1.0f : 0.0f);
+    moveAxis.y = (down_ ? 1.0f : 0.0f) - (up_ ? 1.0f : 0.0f);
+  }
+  commandBuffer.Submit({CharacterCommandType::Move, moveAxis, 0.0f});
+
+  if (jumpPressed_) {
+    commandBuffer.Submit({CharacterCommandType::JumpPressed, Vec2::Zero(), 0.0f});
+  }
+  if (attackPressed_) {
+    commandBuffer.Submit({CharacterCommandType::AttackPressed, Vec2::Zero(), 0.0f});
+  }
+  if (skill1Pressed_) {
+    commandBuffer.Submit({CharacterCommandType::Skill1Pressed, Vec2::Zero(), 0.0f});
+  }
+  if (dashPressed_) {
+    commandBuffer.Submit({CharacterCommandType::DashPressed, Vec2::Zero(), 0.0f});
+  }
+
+  ClearFrameState();
+}
+
+void CharacterInputRouter::ClearFrameState() {
+  jumpPressed_ = false;
+  attackPressed_ = false;
+  skill1Pressed_ = false;
+  dashPressed_ = false;
+}
+
+} // namespace frostbite2D