fix: add import button for OpenCode/OpenClaw empty state and remove auto-import on startup

Previously OpenCode and OpenClaw auto-imported providers from live config
on app startup, which could confuse users. Now they follow the same
pattern as Claude/Codex/Gemini: manual import via the empty state button.

src/lib/api/providers.ts

@@ -110,6 +110,14 @@ export const providersApi = {
   async getOpenClawLiveProviderIds(): Promise<string[]> {
     return await invoke("get_openclaw_live_provider_ids");
   },
+
+  /**
+   * 从 OpenClaw live 配置导入供应商到数据库
+   * OpenClaw 特有功能：由于累加模式，用户可能已在 openclaw.json 中配置供应商
+   */
+  async importOpenClawFromLive(): Promise<number> {
+    return await invoke("import_openclaw_providers_from_live");
+  },
 };
 
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