feat: 旋转单位改为度并支持轨迹点拖拽

统一数据模型中的旋转为度数并在渲染时转弧度，新增 InspectorAngleField 角度控件，为场景与轨迹点提供滑块和重置按钮；选中轨迹点时角色预览到该点并支持拖拽 gizmo 调整位置；机位点击统一走 selectObject 以正确切换右侧属性卡片。

src/editor/schema/timeline.ts

@@ -1,4 +1,5 @@
 import { Euler, Quaternion } from "three";
+import { degreesToRadians, radiansToDegrees } from "./directorProject";
 
 export type TransformTuple = [number, number, number];
 
@@ -100,11 +101,12 @@ const _tmpEuler = new Euler();
 
 function slerpRotation(a: TransformTuple, b: TransformTuple, t: number): TransformTuple {
   if (a[0] === b[0] && a[1] === b[1] && a[2] === b[2]) return [a[0], a[1], a[2]];
-  _qa.setFromEuler(_tmpEuler.set(a[0], a[1], a[2]));
-  _qb.setFromEuler(_tmpEuler.set(b[0], b[1], b[2]));
+  // 关键帧里存的是度数；四元数插值要弧度，插完再转回度数，保持数据模型单位一致
+  _qa.setFromEuler(_tmpEuler.set(degreesToRadians(a[0]), degreesToRadians(a[1]), degreesToRadians(a[2])));
+  _qb.setFromEuler(_tmpEuler.set(degreesToRadians(b[0]), degreesToRadians(b[1]), degreesToRadians(b[2])));
   _qr.slerpQuaternions(_qa, _qb, t);
   _tmpEuler.setFromQuaternion(_qr);
-  return [_tmpEuler.x, _tmpEuler.y, _tmpEuler.z];
+  return [radiansToDegrees(_tmpEuler.x), radiansToDegrees(_tmpEuler.y), radiansToDegrees(_tmpEuler.z)];
 }
 
 function lerpTransformValue(a: KeyframeTransformValue, b: KeyframeTransformValue, t: number): KeyframeTransformValue {