Make deprecated-init-param warnings recommend the preferred Service.Settings(...) pattern

Move the warning helper into AIService as _warn_init_param_moved_to_settings.
It now uses type(self).__name__ to produce messages like
"Use settings=AnthropicLLMService.Settings(model=...)" instead of the raw
settings class name "AnthropicLLMSettings(model=...)". Callers no longer need
to pass the settings class explicitly.

src/pipecat/services/cerebras/llm.py

@@ -14,7 +14,6 @@ from loguru import logger
 from pipecat.adapters.services.open_ai_adapter import OpenAILLMInvocationParams
 from pipecat.services.openai.base_llm import BaseOpenAILLMService
 from pipecat.services.openai.llm import OpenAILLMService
-from pipecat.services.settings import _warn_deprecated_param
 
 
 @dataclass
@@ -62,7 +61,7 @@ class CerebrasLLMService(OpenAILLMService):
 
         # 2. Apply direct init arg overrides (deprecated)
         if model is not None:
-            _warn_deprecated_param("model", self.Settings, "model")
+            self._warn_init_param_moved_to_settings("model", "model")
             default_settings.model = model
 
         # 3. (No step 3, as there's no params object to apply)