初始提交：三玩法 Web 原型与设计文档

- 玩法一 数字一笔：规则库、求解器、26 关、竖屏触摸 Web 原型、测试
- 玩法二 连连气球：连消畅玩版核心、Web 原型、Cocos 球槽组件与导出脚本
- 玩法三 六边一笔：规则库、求解器、10 关 + 转墙实验包、Web 原型、测试
- 产品文档、UI 设计规范、各玩法 GDD / HANDOFF
- 文档移除全部外部参考作引用；删除玩法二 v0 旧稿

modes/02-connect-1234/src/record.ts

@@ -0,0 +1,25 @@
+import type { StoragePort } from './storage';
+import type { FlowStats } from './flow';
+export const FLOW_SAVE_KEY = 'mode:02-connect-1234:balloons-v2';
+export interface FlowRecord { version: 2; bestScore: number; bestNumber: number; bestCombo: number; bestFlown: number; sound: boolean }
+export function freshRecord(): FlowRecord { return { version: 2, bestScore: 0, bestNumber: 0, bestCombo: 0, bestFlown: 0, sound: true }; }
+export function loadRecord(storage: StoragePort): FlowRecord {
+  const result = freshRecord();
+  try {
+    const saved = JSON.parse(storage.read(FLOW_SAVE_KEY) || 'null');
+    if (saved?.version !== 2) return result;
+    for (const key of ['bestScore', 'bestNumber', 'bestCombo', 'bestFlown'] as const)
+      if (Number.isSafeInteger(saved[key]) && saved[key] >= 0) result[key] = saved[key];
+    if (typeof saved.sound === 'boolean') result.sound = saved.sound;
+  } catch { /* 损坏或不可用存储不影响游玩 */ }
+  return result;
+}
+export function recordRound(record: FlowRecord, stats: FlowStats): void {
+  record.bestScore = Math.max(record.bestScore, stats.score);
+  record.bestNumber = Math.max(record.bestNumber, stats.maxNumber);
+  record.bestCombo = Math.max(record.bestCombo, stats.bestCombo);
+  record.bestFlown = Math.max(record.bestFlown, stats.flown);
+}
+export function saveRecord(storage: StoragePort, record: FlowRecord): boolean {
+  try { storage.write(FLOW_SAVE_KEY, JSON.stringify(record)); return true; } catch { return false; }
+}