优化内容： 1. 支出对比优化：所有时期支出变化现在显示具体金额差异，提供更直观的数据对比 2. 订阅数统计修复：修正活跃订阅数量计算逻辑，确保数据准确性 3. 比较逻辑改进：优化月度、季度、年度数据比较机制，避免无意义的数据对比 4. 用户体验提升：统一各时期数据展示规则，提供一致的分析体验 改进效果： 1. 支出变化显示更加清晰易懂 2. 订阅数量统计更加准确 3. 数据对比更加合理有效 Improvements: 1. Expense Comparison Enhancement: All period expense changes now display specific amount differences for more intuitive data comparison 2. Subscription Count Fix: Corrected active subscription calculation logic to ensure data accuracy 3. Comparison Logic Improvement: Optimized monthly, quarterly, and yearly data comparison mechanisms to avoid meaningless comparisons 4. User Experience Enhancement: Unified data display rules across all periods for consistent analytics experience Benefits: 1. Clearer and more understandable expense change displays 2. More accurate subscription count statistics 3. More reasonable and effective data comparisons