feat: add chat_tui example for FastGPT with Textual interface

- Introduced a new example script `chat_tui.py` that provides a full-screen Textual interface for interacting with FastGPT.
- Implemented streaming chat updates, workflow logging, and modal handling for interactive nodes.
- Enhanced FastGPT client with new streaming capabilities and structured event types for better interaction handling.
- Normalized base URL handling in the client to prevent duplicate `/api` paths.
- Added tests for streaming event parsing and interaction handling.

examples/basic_usage.py

@@ -153,29 +153,29 @@ def delete_chat_item():
 
 
 if __name__ == "__main__":
-    # print("=== Simple Chat ===")
-    # try:
-    #     simple_chat()
-    # except Exception as e:
-    #     print(f"Error: {e}")
+    print("=== Simple Chat ===")
+    try:
+        simple_chat()
+    except Exception as e:
+        print(f"Error: {e}")
 
-    # print("\n=== Streaming Chat ===")
-    # try:
-    #     streaming_chat()
-    # except Exception as e:
-    #     print(f"Error: {e}")
+    print("\n=== Streaming Chat ===")
+    try:
+        streaming_chat()
+    except Exception as e:
+        print(f"Error: {e}")
 
-    # print("\n=== Chat with Context ===")
-    # try:
-    #     chat_with_context()
-    # except Exception as e:
-    #     print(f"Error: {e}")
+    print("\n=== Chat with Context ===")
+    try:
+        chat_with_context()
+    except Exception as e:
+        print(f"Error: {e}")
 
-    # print("\n=== Get Histories ===")
-    # try:
-    #     get_histories()
-    # except Exception as e:
-    #     print(f"Error: {e}")
+    print("\n=== Get Histories ===")
+    try:
+        get_histories()
+    except Exception as e:
+        print(f"Error: {e}")
 
     print("\n=== Delete Chat Item ===")
     try: