feat: add PageIndex SDK with local/cloud dual-mode support (#207)

tests/test_cloud_backend.py

@@ -0,0 +1,16 @@
+from pageindex.backend.cloud import CloudBackend, API_BASE
+
+
+def test_cloud_backend_init():
+    backend = CloudBackend(api_key="pi-test")
+    assert backend._api_key == "pi-test"
+    assert backend._headers["api_key"] == "pi-test"
+
+
+def test_api_base_url():
+    assert "pageindex.ai" in API_BASE
+
+
+def test_get_retrieve_model_is_none():
+    backend = CloudBackend(api_key="pi-test")
+    assert backend.get_agent_tools("col").function_tools == []