feat: 添加多个 LSP 测试示例，包括能力测试、调用层次和原始 LSP 测试

codex-lens/test_simple_function.py

@@ -0,0 +1,19 @@
+"""Simple test file with clear function definitions."""
+
+def hello_world():
+    """A simple function."""
+    return "Hello, World!"
+
+def greet(name: str) -> str:
+    """Greet someone by name."""
+    return f"Hello, {name}!"
+
+def main():
+    """Main function that calls other functions."""
+    msg = hello_world()
+    greeting = greet("Alice")
+    print(msg)
+    print(greeting)
+
+if __name__ == "__main__":
+    main()