fix: 清理AI遗留代码，修复场景配置

- 删除三套旧菜单系统 (MainMenu.cs, MainMenuUI.cs, ModeSelectionUI.cs)
- Ground 添加 BoxCollider 并设置 tag 为 Ground
- UIManager.OnReturnClicked 改为通过 PageController 返回首页
- PageController 增加 ReturnToHome 方法，管理 BtnFixationBack 可见性
- 清理废弃场景 Experiment.unity / ModeSelection.unity 及历史截图

Doc/WebGLBuildSever/node_modules/get-proto/test/index.js

@@ -0,0 +1,68 @@
+'use strict';
+
+var test = require('tape');
+
+var getProto = require('../');
+
+test('getProto', function (t) {
+	t.equal(typeof getProto, 'function', 'is a function');
+
+	t.test('can get', { skip: !getProto }, function (st) {
+		if (getProto) { // TS doesn't understand tape's skip
+			var proto = { b: 2 };
+			st.equal(getProto(proto), Object.prototype, 'proto: returns the [[Prototype]]');
+
+			st.test('nullish value', function (s2t) {
+			// @ts-expect-error
+				s2t['throws'](function () { return getProto(undefined); }, TypeError, 'undefined is not an object');
+				// @ts-expect-error
+				s2t['throws'](function () { return getProto(null); }, TypeError, 'null is not an object');
+				s2t.end();
+			});
+
+			// @ts-expect-error
+			st['throws'](function () { getProto(true); }, 'throws for true');
+			// @ts-expect-error
+			st['throws'](function () { getProto(false); }, 'throws for false');
+			// @ts-expect-error
+			st['throws'](function () { getProto(42); }, 'throws for 42');
+			// @ts-expect-error
+			st['throws'](function () { getProto(NaN); }, 'throws for NaN');
+			// @ts-expect-error
+			st['throws'](function () { getProto(0); }, 'throws for +0');
+			// @ts-expect-error
+			st['throws'](function () { getProto(-0); }, 'throws for -0');
+			// @ts-expect-error
+			st['throws'](function () { getProto(Infinity); }, 'throws for ∞');
+			// @ts-expect-error
+			st['throws'](function () { getProto(-Infinity); }, 'throws for -∞');
+			// @ts-expect-error
+			st['throws'](function () { getProto(''); }, 'throws for empty string');
+			// @ts-expect-error
+			st['throws'](function () { getProto('foo'); }, 'throws for non-empty string');
+			st.equal(getProto(/a/g), RegExp.prototype);
+			st.equal(getProto(new Date()), Date.prototype);
+			st.equal(getProto(function () {}), Function.prototype);
+			st.equal(getProto([]), Array.prototype);
+			st.equal(getProto({}), Object.prototype);
+
+			var nullObject = { __proto__: null };
+			if ('toString' in nullObject) {
+				st.comment('no null objects in this engine');
+				st.equal(getProto(nullObject), Object.prototype, '"null" object has Object.prototype as [[Prototype]]');
+			} else {
+				st.equal(getProto(nullObject), null, 'null object has null [[Prototype]]');
+			}
+		}
+
+		st.end();
+	});
+
+	t.test('can not get', { skip: !!getProto }, function (st) {
+		st.equal(getProto, null);
+
+		st.end();
+	});
+
+	t.end();
+});