nav: 三级导航分页结构 + 中国地区索引

- 02-game-design 地图结构重写：洲→国家→城市，3x3棋盘分页
- 中国 40 城按 8 地区分组（华北/东北/华东/华中/华南/西南/西北/港澳）
- 导航索引数据：continents/index + asia + regions/china + pagination工具

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

js/content/continents/asia.js

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+// 亚洲国家列表 — 16 国，分 2 页
+
+export const asiaCountries = [
+  // Page 1
+  { id: 'china',      name: '中国',     nameEn: 'China',      sortOrder: 1,  themeColor: '#CC2936', hasRegions: true, totalCities: 40 },
+  { id: 'japan',      name: '日本',     nameEn: 'Japan',      sortOrder: 2,  themeColor: '#E84057', hasRegions: false, totalCities: 4 },
+  { id: 'korea',      name: '韩国',     nameEn: 'South Korea', sortOrder: 3, themeColor: '#4A90D9', hasRegions: false, totalCities: 3 },
+  { id: 'thailand',   name: '泰国',     nameEn: 'Thailand',   sortOrder: 4,  themeColor: '#FFB347', hasRegions: false, totalCities: 3 },
+  { id: 'singapore',  name: '新加坡',   nameEn: 'Singapore',  sortOrder: 5,  themeColor: '#00A896', hasRegions: false, totalCities: 1 },
+  { id: 'vietnam',    name: '越南',     nameEn: 'Vietnam',    sortOrder: 6,  themeColor: '#E74C3C', hasRegions: false, totalCities: 2 },
+  { id: 'malaysia',   name: '马来西亚', nameEn: 'Malaysia',   sortOrder: 7,  themeColor: '#3498DB', hasRegions: false, totalCities: 2 },
+  { id: 'indonesia',  name: '印度尼西亚', nameEn: 'Indonesia', sortOrder: 8, themeColor: '#E67E22', hasRegions: false, totalCities: 2 },
+  { id: 'philippines', name: '菲律宾',  nameEn: 'Philippines', sortOrder: 9, themeColor: '#2ECC71', hasRegions: false, totalCities: 1 },
+  // Page 2
+  { id: 'india',      name: '印度',     nameEn: 'India',      sortOrder: 10, themeColor: '#FF9933', hasRegions: false, totalCities: 2 },
+  { id: 'uae',        name: '阿联酋',   nameEn: 'UAE',        sortOrder: 11, themeColor: '#C0A062', hasRegions: false, totalCities: 1 },
+  { id: 'turkey',     name: '土耳其',   nameEn: 'Turkey',     sortOrder: 12, themeColor: '#1A5276', hasRegions: false, totalCities: 1 },
+  { id: 'israel',     name: '以色列',   nameEn: 'Israel',     sortOrder: 13, themeColor: '#5DADE2', hasRegions: false, totalCities: 1 },
+  { id: 'nepal',      name: '尼泊尔',   nameEn: 'Nepal',      sortOrder: 14, themeColor: '#DC143C', hasRegions: false, totalCities: 1 },
+  { id: 'cambodia',   name: '柬埔寨',   nameEn: 'Cambodia',   sortOrder: 15, themeColor: '#1E8449', hasRegions: false, totalCities: 1 },
+  { id: 'sri_lanka',  name: '斯里兰卡', nameEn: 'Sri Lanka',  sortOrder: 16, themeColor: '#8E44AD', hasRegions: false, totalCities: 1 },
+  { id: 'myanmar',    name: '缅甸',     nameEn: 'Myanmar',    sortOrder: 17, themeColor: '#F4D03F', hasRegions: false, totalCities: 1 },
+  { id: 'mongolia',   name: '蒙古',     nameEn: 'Mongolia',   sortOrder: 18, themeColor: '#2980B9', hasRegions: false, totalCities: 1 },
+]
+
+// 分页：2 页
+export const asiaCountryPages = [
+  asiaCountries.slice(0, 9),
+  asiaCountries.slice(9),
+]
+
+export default asiaCountries

js/content/continents/index.js

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+// 洲索引 — 3x3 棋盘第 1 级
+// 每页 9 格，当前 6 个洲 + 3 空位
+
+export const continents = [
+  { id: 'asia',       name: '亚洲',   nameEn: 'Asia',          sortOrder: 1, themeColor: '#FF6B6B', icon: '🏯', totalCities: 70 },
+  { id: 'europe',     name: '欧洲',   nameEn: 'Europe',        sortOrder: 2, themeColor: '#6B8CFF', icon: '🏰', totalCities: 28 },
+  { id: 'north_america', name: '北美洲', nameEn: 'North America', sortOrder: 3, themeColor: '#FFB347', icon: '🗽', totalCities: 12 },
+  { id: 'south_america', name: '南美洲', nameEn: 'South America', sortOrder: 4, themeColor: '#4ECDC4', icon: '🌴', totalCities: 7 },
+  { id: 'africa',     name: '非洲',   nameEn: 'Africa',        sortOrder: 5, themeColor: '#F7DC6F', icon: '🦁', totalCities: 5 },
+  { id: 'oceania',    name: '大洋洲', nameEn: 'Oceania',       sortOrder: 6, themeColor: '#82E0AA', icon: '🦘', totalCities: 4 },
+]
+
+// 分页：1 页（6 项 ≤ 9）
+export const continentPages = [continents]
+
+export default continents