Revert "feat: add proxy geo location"

This reverts commit 09c4f82927ddce1c9528c146a26457f53d02b034.

frontend/src/api/admin/proxies.ts

@@ -126,7 +126,6 @@ export async function testProxy(id: number): Promise<{
   city?: string
   region?: string
   country?: string
-  country_code?: string
 }> {
   const { data } = await apiClient.post<{
     success: boolean
@@ -136,7 +135,6 @@ export async function testProxy(id: number): Promise<{
     city?: string
     region?: string
     country?: string
-    country_code?: string
   }>(`/admin/proxies/${id}/test`)
   return data
 }