Prefer Service.Settings over raw settings class names across all services

Replace direct references to settings class names (e.g. `FooSettings`) with the nested `Settings` alias form throughout all 87 service files:
- Type annotations: `Settings`
- Runtime code: `self.Settings`
- Docstrings: `ServiceClass.Settings`
- Cross-file inheritance: `ParentService.Settings`

This makes the `Settings` alias the canonical way to reference a service's settings, keeping only the class definition and alias assignment as the remaining hits for each raw settings class name.

src/pipecat/services/cerebras/llm.py

@@ -12,13 +12,13 @@ from typing import Optional
 from loguru import logger
 
 from pipecat.adapters.services.open_ai_adapter import OpenAILLMInvocationParams
-from pipecat.services.openai.base_llm import OpenAILLMSettings
+from pipecat.services.openai.base_llm import BaseOpenAILLMService
 from pipecat.services.openai.llm import OpenAILLMService
 from pipecat.services.settings import _warn_deprecated_param
 
 
 @dataclass
-class CerebrasLLMSettings(OpenAILLMSettings):
+class CerebrasLLMSettings(BaseOpenAILLMService.Settings):
     """Settings for CerebrasLLMService."""
 
     pass
@@ -32,7 +32,7 @@ class CerebrasLLMService(OpenAILLMService):
     """
 
     Settings = CerebrasLLMSettings
-    _settings: CerebrasLLMSettings
+    _settings: Settings
 
     def __init__(
         self,
@@ -40,7 +40,7 @@ class CerebrasLLMService(OpenAILLMService):
         api_key: str,
         base_url: str = "https://api.cerebras.ai/v1",
         model: Optional[str] = None,
-        settings: Optional[CerebrasLLMSettings] = None,
+        settings: Optional[Settings] = None,
         **kwargs,
     ):
         """Initialize the Cerebras LLM service.
@@ -51,18 +51,18 @@ class CerebrasLLMService(OpenAILLMService):
             model: The model identifier to use. Defaults to "gpt-oss-120b".
 
                 .. deprecated:: 0.0.105
-                    Use ``settings=OpenAILLMSettings(model=...)`` instead.
+                    Use ``settings=CerebrasLLMService.Settings(model=...)`` instead.
 
             settings: Runtime-updatable settings. When provided alongside deprecated
                 parameters, ``settings`` values take precedence.
             **kwargs: Additional keyword arguments passed to OpenAILLMService.
         """
         # 1. Initialize default_settings with hardcoded defaults
-        default_settings = CerebrasLLMSettings(model="gpt-oss-120b")
+        default_settings = self.Settings(model="gpt-oss-120b")
 
         # 2. Apply direct init arg overrides (deprecated)
         if model is not None:
-            _warn_deprecated_param("model", CerebrasLLMSettings, "model")
+            _warn_deprecated_param("model", self.Settings, "model")
             default_settings.model = model
 
         # 3. (No step 3, as there's no params object to apply)