feat: 多租户实时切换 — 前端拦截器统一entity_id + 后端get_entity_id依赖 + dashboard 6端点支持租户过滤

- 前端: api/index.ts拦截器自动附加X-Entity-Id header + entity_id query参数
- 后端: 新增app/deps.py的get_entity_id公共依赖(query→header→默认1)
- dashboard.py: summary/kpis/finance-analysis/predict/my-kpis/my-dashboard全部支持entity_id
- 解决: 42个页面仅13个传entity_id导致切换企业后数据混乱

frontend/src/api/index.ts

@@ -8,6 +8,12 @@ const api = axios.create({
 api.interceptors.request.use((config) => {
   const token = localStorage.getItem('cma_token')
   if (token) config.headers.Authorization = `Bearer ${token}`
+  // 多租户实时切换：统一附加当前企业ID（解决29个页面未传entity_id的问题）
+  const entityId = Number(localStorage.getItem('cma_entity_id') || 1)
+  config.headers['X-Entity-Id'] = String(entityId)
+  if (config.method === 'get' || config.method === 'GET') {
+    config.params = { ...(config.params || {}), entity_id: entityId }
+  }
   return config
 })