refactor(Company): fetch 请求迁移至 axios

- DeepAnalysis: 4 个 fetch → axios
- DynamicTracking: 3 个 fetch → axios (NewsPanel, ForecastPanel)
- MarketDataView/services: 4 个 fetch → axios
- CompanyOverview/hooks: 9 个 fetch → axios (6 个文件)
- StockQuoteCard/hooks: 1 个 fetch → axios
- ValueChainNodeCard: 1 个 fetch → axios

清理:
- 删除未使用的 useCompanyOverviewData.ts
- 移除所有 getApiBase/API_BASE_URL 引用

总计: 22 个 fetch 调用迁移, 复用项目已有的 axios 拦截器配置

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

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

src/views/Company/components/CompanyOverview/hooks/useAnnouncementsData.ts

@@ -3,11 +3,9 @@
 
 import { useState, useEffect, useCallback } from "react";
 import { logger } from "@utils/logger";
-import { getApiBase } from "@utils/apiConfig";
+import axios from "@utils/axiosConfig";
 import type { Announcement } from "../types";
 
-const API_BASE_URL = getApiBase();
-
 interface ApiResponse<T> {
   success: boolean;
   data: T;
@@ -35,10 +33,9 @@ export const useAnnouncementsData = (stockCode?: string): UseAnnouncementsDataRe
     setError(null);
 
     try {
-      const response = await fetch(
-        `${API_BASE_URL}/api/stock/${stockCode}/announcements?limit=20`
+      const { data: result } = await axios.get<ApiResponse<Announcement[]>>(
+        `/api/stock/${stockCode}/announcements?limit=20`
       );
-      const result = (await response.json()) as ApiResponse<Announcement[]>;
 
       if (result.success) {
         setAnnouncements(result.data);