fix(api): fix incorrect path handling in Langfuse integration (#22766)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/core/ops/entities/config_entity.py

     @field_validator("host")
     @classmethod
     def host_validator(cls, v, info: ValidationInfo):
-        return cls.validate_endpoint_url(v, "https://api.langfuse.com")
+        return validate_url_with_path(v, "https://api.langfuse.com")
 
 
 class LangSmithConfig(BaseTracingConfig):

api/core/ops/utils.py

 
 def validate_url(url: str, default_url: str, allowed_schemes: tuple = ("https", "http")) -> str:
     """
-    Validate and normalize URL with proper error handling
+    Validate and normalize URL with proper error handling.
+
+    NOTE: This function does not retain the `path` component of the provided URL.
+    In most cases, it is recommended to use `validate_url_with_path` instead.
+
+    This function is deprecated and retained only for compatibility purposes.
+    New implementations should use `validate_url_with_path`.
 
     Args:
         url: The URL to validate

api/tests/unit_tests/core/ops/test_config_entity.py

         assert config.secret_key == "secret_key"
         assert config.host == "https://custom.langfuse.com"
 
+    def test_valid_config_with_path(self):
+        host = host = "https://custom.langfuse.com/api/v1"
+        config = LangfuseConfig(public_key="public_key", secret_key="secret_key", host=host)
+        assert config.public_key == "public_key"
+        assert config.secret_key == "secret_key"
+        assert config.host == host
+
     def test_default_values(self):
         """Test default values are set correctly"""
         config = LangfuseConfig(public_key="public", secret_key="secret")