feat(deeplink): 深链支持用量查询配置 (#400)

## 新增功能
- 深链导入支持用量查询配置参数：
  - `usageEnabled`: 是否启用用量查询
  - `usageScript`: Base64 编码的用量查询脚本
  - `usageApiKey`: 用量查询专用 API Key
  - `usageBaseUrl`: 用量查询专用 Base URL
  - `usageAccessToken`: 访问令牌（NewAPI 模板）
  - `usageUserId`: 用户 ID（NewAPI 模板）
  - `usageAutoInterval`: 自动查询间隔（分钟）

## 修改文件
- **mod.rs**: DeepLinkImportRequest 结构体添加用量查询字段
- **parser.rs**: 解析 URL 中的用量查询参数
- **provider.rs**: 构建 ProviderMeta 包含 UsageScript 配置
- **deeplink.ts**: 添加 TypeScript 类型定义
- **DeepLinkImportDialog.tsx**: 确认对话框显示用量查询配置

## Bug 修复
- **formatters.ts**: 修复 formatJSON() 格式化时删除 "env" 键的问题

## 深链格式示例
```
ccswitch://v1/import?resource=provider&app=claude&name=xxx&usageEnabled=true&usageScript={base64}&usageAutoInterval=30
```

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

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src-tauri/src/deeplink/provider.rs

@@ -5,7 +5,7 @@
 use super::utils::{decode_base64_param, infer_homepage_from_endpoint};
 use super::DeepLinkImportRequest;
 use crate::error::AppError;
-use crate::provider::Provider;
+use crate::provider::{Provider, ProviderMeta, UsageScript};
 use crate::services::ProviderService;
 use crate::store::AppState;
 use crate::AppType;
@@ -117,6 +117,9 @@ pub(crate) fn build_provider_from_request(
         AppType::Gemini => build_gemini_settings(request),
     };
 
+    // Build usage script configuration if provided
+    let meta = build_provider_meta(request)?;
+
     let provider = Provider {
         id: String::new(), // Will be generated by caller
         name: request.name.clone().unwrap_or_default(),
@@ -126,7 +129,7 @@ pub(crate) fn build_provider_from_request(
         created_at: None,
         sort_index: None,
         notes: request.notes.clone(),
-        meta: None,
+        meta,
         icon: request.icon.clone(),
         icon_color: None,
         is_proxy_target: None,
@@ -135,6 +138,57 @@ pub(crate) fn build_provider_from_request(
     Ok(provider)
 }
 
+/// Build provider meta with usage script configuration
+fn build_provider_meta(request: &DeepLinkImportRequest) -> Result<Option<ProviderMeta>, AppError> {
+    // Check if any usage script fields are provided
+    if request.usage_script.is_none()
+        && request.usage_enabled.is_none()
+        && request.usage_api_key.is_none()
+        && request.usage_base_url.is_none()
+        && request.usage_access_token.is_none()
+        && request.usage_user_id.is_none()
+        && request.usage_auto_interval.is_none()
+    {
+        return Ok(None);
+    }
+
+    // Decode usage script code if provided
+    let code = if let Some(script_b64) = &request.usage_script {
+        let decoded = decode_base64_param("usage_script", script_b64)?;
+        String::from_utf8(decoded)
+            .map_err(|e| AppError::InvalidInput(format!("Invalid UTF-8 in usage_script: {e}")))?
+    } else {
+        String::new()
+    };
+
+    // Determine enabled state: explicit param > has code > false
+    let enabled = request.usage_enabled.unwrap_or(!code.is_empty());
+
+    // Build UsageScript - use provider's API key and endpoint as defaults
+    let usage_script = UsageScript {
+        enabled,
+        language: "javascript".to_string(),
+        code,
+        timeout: Some(10),
+        api_key: request
+            .usage_api_key
+            .clone()
+            .or_else(|| request.api_key.clone()),
+        base_url: request
+            .usage_base_url
+            .clone()
+            .or_else(|| request.endpoint.clone()),
+        access_token: request.usage_access_token.clone(),
+        user_id: request.usage_user_id.clone(),
+        auto_query_interval: request.usage_auto_interval,
+    };
+
+    Ok(Some(ProviderMeta {
+        usage_script: Some(usage_script),
+        ..Default::default()
+    }))
+}
+
 /// Build Claude settings configuration
 fn build_claude_settings(request: &DeepLinkImportRequest) -> serde_json::Value {
     let mut env = serde_json::Map::new();