feat(opencode): Phase 6 - Tauri command extensions for OpenCode

- Add import_opencode_providers_from_live command to provider.rs
- Register new command in lib.rs invoke_handler
- Update commands/mcp.rs: include OpenCode in sync_other_side logic
- Add McpService::import_from_opencode to import_mcp_from_apps
- Implement MCP sync/remove for OpenCode in services/mcp.rs
  - sync_server_to_app_no_config now calls sync_single_server_to_opencode
  - remove_server_from_app now calls remove_server_from_opencode

src-tauri/src/commands/provider.rs

@@ -325,3 +325,17 @@ pub fn sync_universal_provider(
 
     Ok(result)
 }
+
+// ============================================================================
+// OpenCode 专属命令
+// ============================================================================
+
+/// 从 OpenCode live 配置导入供应商到数据库
+///
+/// 这是 OpenCode 特有的功能，因为 OpenCode 使用累加模式，
+/// 用户可能已经在 opencode.json 中配置了供应商。
+#[tauri::command]
+pub fn import_opencode_providers_from_live(state: State<'_, AppState>) -> Result<usize, String> {
+    crate::services::provider::import_opencode_providers_from_live(state.inner())
+        .map_err(|e| e.to_string())
+}