feat: 新增物理弹球实验室及配套功能

1. 新增物理弹球游戏全套代码，包含物理引擎、规则、渲染、游戏逻辑、存档、音效、UI
2. 新增物理弹球相关调试与单元测试脚本
3. 优化私有剪贴上传功能：增加200MB上传限制与错误提示
4. 修复复古弹球桌的光滑面防粘附与休眠逻辑

dev_test_scripts/debug/debug_physics_balls_dom_smoke.js

@@ -0,0 +1,126 @@
+/* ============================================================
+ * debug_physics_balls_dom_smoke.js · 物理弹球 · 前端 DOM 桩冒烟
+ * 无浏览器环境下用最小 DOM/Canvas 桩加载全部前端脚本，
+ * 驱动主循环 + 模拟拖拽发射/暂停/记录等交互，捕获运行时错误。
+ * 运行：node dev_test_scripts/debug/debug_physics_balls_dom_smoke.js
+ * ============================================================ */
+'use strict';
+const fs = require('fs');
+const path = require('path');
+const vm = require('vm');
+
+const LAB_DIR = path.join(__dirname, '..', '..', 'public', 'tools', 'thought_lab', 'labs', 'physics_balls');
+const FILES = ['pb_physics.js', 'pb_rules.js', 'pb_storage.js', 'pb_audio.js', 'pb_render.js', 'pb_game.js', 'pb_ui.js'];
+
+function makeCtx() {
+  const store = {};
+  return new Proxy(store, {
+    get(t, k) {
+      if (k === 'createRadialGradient') return () => ({ addColorStop() {} });
+      if (k === 'measureText') return () => ({ width: 10 });
+      if (k in t) return t[k];
+      return function () {};
+    },
+    set(t, k, v) { t[k] = v; return true; }
+  });
+}
+
+function makeEl(id) {
+  const listeners = {};
+  return {
+    id,
+    style: {},
+    dataset: {},
+    classList: { add() {}, remove() {}, toggle() {}, contains() { return false; } },
+    children: [],
+    _html: '', _text: '',
+    set innerHTML(v) { this._html = v; this.children = []; },
+    get innerHTML() { return this._html; },
+    set textContent(v) { this._text = String(v); },
+    get textContent() { return this._text; },
+    appendChild(c) { this.children.push(c); },
+    addEventListener(t, f) { (listeners[t] = listeners[t] || []).push(f); },
+    dispatch(t, ev) { (listeners[t] || []).forEach(f => f(ev || {})); },
+    getBoundingClientRect() { return { left: 0, top: 0, width: 420, height: 880 }; },
+    getContext() { return makeCtx(); },
+    checked: true,
+    width: 420, height: 880
+  };
+}
+
+const els = {};
+function getEl(id) { if (!els[id]) els[id] = makeEl(id); return els[id]; }
+
+let rafCb = null;
+const winListeners = {};
+const sandbox = {
+  console, Math, Date, setTimeout, clearTimeout,
+  JSON, localStorage: { getItem: () => null, setItem: () => {}, removeItem: () => {} },
+  navigator: { clipboard: { writeText: () => ({ then: (a) => a && a() }) } },
+  requestAnimationFrame: (cb) => { rafCb = cb; return 1; },
+  document: {
+    getElementById: getEl,
+    createElement: (tag) => makeEl('dyn_' + tag)
+  },
+  addEventListener: (t, f) => { (winListeners[t] = winListeners[t] || []).push(f); },
+  dispatchWin: (t, ev) => { (winListeners[t] || []).forEach(f => f(ev || {})); },
+  window: null
+};
+sandbox.window = sandbox;
+sandbox.globalThis = sandbox;
+vm.createContext(sandbox);
+
+for (const f of FILES) {
+  vm.runInContext(fs.readFileSync(path.join(LAB_DIR, f), 'utf-8'), sandbox, { filename: f });
+}
+
+function frames(n, t0) {
+  for (let i = 0; i < n; i++) {
+    const cb = rafCb; rafCb = null;
+    if (!cb) throw new Error('rAF chain broken');
+    cb(t0 + i * 16.7);
+  }
+}
+
+console.log('== 物理弹球 DOM 冒烟 ==');
+// init（load 事件不会在 vm 里触发，手动调）
+sandbox.PBUi.init();
+frames(30, 0);
+console.log('  ✓ init + 30 帧主菜单渲染');
+
+// 模拟拖拽发射（pointermove/up 注册在 window 级）
+const canvas = getEl('pb-canvas');
+canvas.dispatch('pointerdown', { clientX: 260, clientY: 600 });
+frames(5, 600);
+sandbox.dispatchWin('pointermove', { clientX: 300, clientY: 650 });
+sandbox.dispatchWin('pointerup', {});
+frames(60 * 6, 700);
+console.log('  ✓ 拖拽发射 + 6s 模拟');
+
+// 暂停 / 继续
+getEl('pb-pause-btn').dispatch('click');
+getEl('pb-resume').dispatch('click');
+frames(60, 60 * 7 * 16.7);
+console.log('  ✓ 暂停/继续');
+
+// 记录页 / 指南 / 设置 / 每日领取
+getEl('pb-side-records').dispatch('click');
+getEl('pb-records-close').dispatch('click');
+getEl('pb-help').dispatch('click');
+getEl('pb-guide-ok').dispatch('click');
+getEl('pb-gear').dispatch('click');
+getEl('pb-settings-close').dispatch('click');
+getEl('pb-daily').dispatch('click');
+console.log('  ✓ 记录/指南/设置/每日领取交互');
+
+// 长时模拟 60s，覆盖回合推进/上升/回收
+for (let s = 0; s < 60; s++) {
+  if (s % 7 === 0) {
+    canvas.dispatch('pointerdown', { clientX: 150 + (s * 13) % 200, clientY: 620 });
+    sandbox.dispatchWin('pointermove', { clientX: 190 + (s * 13) % 160, clientY: 660 });
+    sandbox.dispatchWin('pointerup', {});
+  }
+  frames(60, (10 + s) * 1000);
+}
+console.log('  ✓ 60s 长时模拟（含多次发射）');
+console.log('\n冒烟通过，无运行时异常');