test: 修复所有已知问题并全面提高测试覆盖率至 90%

KNOWN-007: solarTime.ts 单元测试
KNOWN-008: 消除生产代码中 as any 类型断言
KNOWN-002: 工具层测试覆盖
KNOWN-003: lruCache 边界测试
KNOWN-004: templateService 分支覆盖（100%）
KNOWN-001: 6个业务组件测试
额外修复: searchOptimizer memoize bug, templateService 常量修改 bug

测试覆盖率: 75.71% -> 90.22%, 测试用例: 412 -> 671

everything-is-suitable-uniapp/src/services/templateService.ts

@@ -190,7 +190,7 @@ export class TemplateService {
   }
 
   async saveTemplate(template: ReportTemplate): Promise<void> {
-    const templates = await this.getTemplates()
+    const templates = [...(await this.getTemplates())]
     const index = templates.findIndex(t => t.id === template.id)
     if (index >= 0) {
       templates[index] = template
@@ -201,7 +201,7 @@ export class TemplateService {
   }
 
   async deleteTemplate(id: string): Promise<boolean> {
-    const templates = await this.getTemplates()
+    const templates = [...(await this.getTemplates())]
     const index = templates.findIndex(t => t.id === id)
     if (index < 0) return false
     templates.splice(index, 1)