refactoring: add initial pipeline configuration and model classes

core/config/llm_config.py

@@ -0,0 +1,13 @@
+from pydantic import BaseModel
+
+
+class LLMConfig(BaseModel):
+    """LLM annotation configuration"""
+
+    model_name: str = "mistral:7b"
+    requests_per_minute: int = 60
+    requests_per_second: int = 2
+    retry_attempts: int = 3
+    timeout_seconds: int = 30
+    max_concurrent_requests: int = 2
+    enable_rate_limiting: bool = False