v2.1.5: 密钥状态显示优化 + 版本号统一

- 密钥无到期时间/积分数据时显示"待验证"而非"已激活"
- 后端验证完成后自动更新为真实状态
- 版本号统一更新到2.1.5（provider/client/main）
- 添加.vscodeignore排除大文件

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

extension_clean/package.json

@@ -2,7 +2,7 @@
   "name": "hummingbird-pro",
   "displayName": "蜂鸟Pro",
   "description": "蜂鸟Pro - Cursor 账号管理与智能换号工具",
-  "version": "2.0.1",
+  "version": "2.1.5",
   "publisher": "hummingbird",
   "repository": {
     "type": "git",
@@ -53,6 +53,11 @@
     "configuration": {
       "title": "蜂鸟Pro",
       "properties": {
+        "hummingbird.apiUrl": {
+          "type": "string",
+          "default": "https://api.aicode.edu.pl",
+          "description": "后端 API 地址（支持自定义部署）"
+        },
         "hummingbird.cursorPath": {
           "type": "string",
           "default": "",