feat(external-connector): 默认连接器提供者改为官方版本

将环境变量 CONNECTOR_PROVIDER 的默认值从 "fake" 改为 "official"，
以便在没有明确指定提供者时使用官方的连接器实现。

external-connector/tests/test_main.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from external_connector import main
+
+
+def test_build_app_defaults_to_official_provider(monkeypatch, tmp_path) -> None:
+    monkeypatch.delenv("CONNECTOR_PROVIDER", raising=False)
+    monkeypatch.setenv("CONNECTOR_HOME", str(tmp_path))
+
+    app = main.build_app()
+    health = next(route.endpoint for route in app.routes if route.path == "/health")()
+
+    assert health["providerId"] == "composite"
+    assert [provider["providerId"] for provider in health["providers"]] == ["weixin_ilink", "feishu_bot"]
+
+
+def test_build_app_allows_explicit_fake_provider(monkeypatch, tmp_path) -> None:
+    monkeypatch.setenv("CONNECTOR_PROVIDER", "fake")
+    monkeypatch.setenv("CONNECTOR_HOME", str(tmp_path))
+
+    app = main.build_app()
+    health = next(route.endpoint for route in app.routes if route.path == "/health")()
+
+    assert health["providerId"] == "fake"