feat(companion): 全面确立以陪吃·陪喝·陪唱为主的核心架构，重构首屏推荐阵容与歌声试听

pwuniapp/common/theme.js

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+/**
+ * 前端双主题设计系统核心管理模块
+ * 严格遵照 UI/UX 规范：无 Emoji、纯矢量、高对比度与 WCAG AA 标准
+ */
+
+export const THEME_KEYS = {
+  COOL: 'cool',
+  WARM: 'warm'
+};
+
+export const THEMES = {
+  [THEME_KEYS.COOL]: {
+    key: THEME_KEYS.COOL,
+    name: '冷光暗夜',
+    description: '深邃暗夜黑与电竞靛蓝流光，专业沉浸质感',
+    tokens: {
+      bgPrimary: '#0A0F1D',
+      bgSurface: '#151D30',
+      bgSurfaceElevated: '#1E2942',
+      bgSurfaceGlass: 'rgba(21, 29, 48, 0.85)',
+      colorBrand: '#6366F1',
+      colorBrandLight: '#818CF8',
+      colorBrandGold: '#F59E0B',
+      colorBrandGlow: 'rgba(99, 102, 241, 0.35)',
+      colorBrandGradient: 'linear-gradient(135deg, #6366F1, #8B5CF6)',
+      borderSubtle: '#1E293B',
+      borderFocus: '#4F46E5',
+      textPrimary: '#F8FAFC',
+      textSecondary: '#94A3B8',
+      textMuted: '#64748B',
+      shadowBrand: '0 8rpx 24rpx rgba(99, 102, 241, 0.35)'
+    }
+  },
+  [THEME_KEYS.WARM]: {
+    key: THEME_KEYS.WARM,
+    name: '暖阳赤焰',
+    description: '深邃暖焦糖褐与暖阳曜橙流光，热情温馨有活力',
+    tokens: {
+      bgPrimary: '#140E0A',
+      bgSurface: '#221711',
+      bgSurfaceElevated: '#2E1F17',
+      bgSurfaceGlass: 'rgba(34, 23, 17, 0.85)',
+      colorBrand: '#F97316',
+      colorBrandLight: '#FB923C',
+      colorBrandGold: '#F59E0B',
+      colorBrandGlow: 'rgba(249, 115, 22, 0.35)',
+      colorBrandGradient: 'linear-gradient(135deg, #F97316, #F59E0B)',
+      borderSubtle: '#342217',
+      borderFocus: '#EA580C',
+      textPrimary: '#FFF7ED',
+      textSecondary: '#C7B5A7',
+      textMuted: '#8C7565',
+      shadowBrand: '0 8rpx 24rpx rgba(249, 115, 22, 0.35)'
+    }
+  }
+};
+
+const STORAGE_KEY = 'peiwan_app_theme';
+
+/**
+ * 获取当前持久化的主题标识
+ */
+export function getCurrentThemeKey() {
+  try {
+    const saved = uni.getStorageSync(STORAGE_KEY);
+    if (saved && THEMES[saved]) {
+      return saved;
+    }
+  } catch (e) {
+    // 忽略异常，降级到默认
+  }
+  return THEME_KEYS.COOL;
+}
+
+/**
+ * 获取当前主题配置对象
+ */
+export function getCurrentTheme() {
+  const key = getCurrentThemeKey();
+  return THEMES[key];
+}
+
+/**
+ * 获取当前主题 Tokens
+ */
+export function getCurrentTokens() {
+  return getCurrentTheme().tokens;
+}
+
+/**
+ * 切换全局主题并持久化，广播全局事件
+ */
+export function setTheme(themeKey) {
+  const targetKey = THEMES[themeKey] ? themeKey : THEME_KEYS.COOL;
+  try {
+    uni.setStorageSync(STORAGE_KEY, targetKey);
+  } catch (e) {
+    // 忽略持久化异常
+  }
+  
+  // 广播主题变更事件
+  try {
+    uni.$emit('theme-change', targetKey);
+  } catch (e) {
+    // 忽略事件抛出异常
+  }
+  
+  return THEMES[targetKey];
+}
+
+/**
+ * 获取所有可选主题列表
+ */
+export function getAvailableThemes() {
+  return Object.values(THEMES);
+}