feat: 账套模式全量接入 — 12个API entity_id统一走token解析链 + 前端登录选公司/切换器重签token

- 后端: kpis/bsc_layers/cash/predict/growth_quality/tax_compliance/data 的 entity_id 参数统一改为 Depends(get_entity_id)
- 前端: 拦截器删除自动附加X-Entity-Id/entity_id; 登录页公司选择器(按用户名授权过滤); 切换器改POST /auth/switch-entity重新签发token+整页刷新; ReportCenter同步改造
- 修复前后端不匹配: login-entities路由→/auth/entities; login响应entity_id取user.entity_id

frontend/src/views/ReportCenter.vue

@@ -587,7 +587,7 @@ function getEntityId() {
 
 async function loadEntities() {
   try {
-    const r: any = await api.get('/entities')
+    const r: any = await api.get('/auth/my-entities')
     entities.value = r.data || r || []
     const e = entities.value.find((x: any) => x.id === currentEntityId.value)
     if (e) localStorage.setItem('cma_entity_name', e.short_name || e.name || '')
@@ -596,13 +596,19 @@ async function loadEntities() {
   }
 }
 
-function onEntityChange(id: number) {
-  localStorage.setItem('cma_entity_id', String(id))
-  const e = entities.value.find((x: any) => x.id === id)
-  if (e) localStorage.setItem('cma_entity_name', e.short_name || e.name || '')
-  ElMessage.success(`已切换企业：${e ? e.short_name + ' / ' + e.name : id}`)
-  loadAll()
-  loadStatutory()
+async function onEntityChange(id: number) {
+  // 账套模式：切换走 switch-entity 重新签发token + 整页刷新
+  if (id === Number(localStorage.getItem('cma_entity_id'))) return
+  try {
+    const r: any = await api.post('/auth/switch-entity', { entity_id: id })
+    localStorage.setItem('cma_token', r.token)
+    localStorage.setItem('cma_entity_id', String(r.entity_id))
+    localStorage.setItem('cma_entity_name', r.entity_short_name || r.entity_name || '')
+    ElMessage.success(`已切换企业：${r.entity_short_name || r.entity_name || id}`)
+    location.reload()
+  } catch (e: any) {
+    ElMessage.error(e?.response?.data?.detail || '切换失败')
+  }
 }
 
 // 跨页面同步：其他页面切换企业时联动刷新