feat: 新增 financialService 类型声明和 EChartsWrapper 组件

- financialService.d.ts: 为 JS 服务文件提供 TypeScript 类型声明
- EChartsWrapper.tsx: 按需引入的 ECharts 包装组件，减小打包体积

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/services/financialService.d.ts

@@ -0,0 +1,49 @@
+// financialService 类型声明
+
+export interface RequestOptions {
+  signal?: AbortSignal;
+}
+
+export interface ApiResponse<T> {
+  success: boolean;
+  data: T;
+  message?: string;
+}
+
+export interface FinancialService {
+  getStockInfo(seccode: string, options?: RequestOptions): Promise<ApiResponse<any>>;
+  getBalanceSheet(seccode: string, limit?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+  getIncomeStatement(seccode: string, limit?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+  getCashflow(seccode: string, limit?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+  getFinancialMetrics(seccode: string, limit?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+  getMainBusiness(seccode: string, periods?: number, options?: RequestOptions): Promise<ApiResponse<any>>;
+  getForecast(seccode: string, options?: RequestOptions): Promise<ApiResponse<any>>;
+  getIndustryRank(seccode: string, limit?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+  getPeriodComparison(seccode: string, periods?: number, options?: RequestOptions): Promise<ApiResponse<any[]>>;
+}
+
+export const financialService: FinancialService;
+
+export interface FormatUtils {
+  formatLargeNumber(num: number, decimal?: number): string;
+  formatPercent(num: number, decimal?: number): string;
+  formatDate(dateStr: string): string;
+  getReportType(dateStr: string): string;
+  getGrowthColor(value: number): string;
+  getTrendIcon(current: number, previous: number): 'up' | 'down' | 'stable';
+  calculateYoY(current: number, yearAgo: number): number | null;
+  calculateQoQ(current: number, previous: number): number | null;
+  getFinancialHealthScore(metrics: any): { score: number; level: string; color: string } | null;
+  getTableColumns(type: string): any[];
+}
+
+export const formatUtils: FormatUtils;
+
+export interface ChartUtils {
+  prepareTrendData(data: any[], metrics: any[]): any[];
+  preparePieData(data: any[], valueKey: string, nameKey: string): any[];
+  prepareComparisonData(data: any[], periods: any[], metrics: any[]): any[];
+  getChartColors(theme?: string): string[];
+}
+
+export const chartUtils: ChartUtils;