Final cleanup: Merge LLM, add Dockerfile

- Merge llm.py + llm_sync.py into single unified client
- Remove llm_sync.py (now just llm.py with both sync/async)
- Add requests to dependencies
- Add Dockerfile for containerized deployment
- Add .dockerignore

All issues resolved!

opus_orchestrator/langgraph_workflow.py

@@ -25,7 +25,7 @@ from langgraph.graph import StateGraph, END
 from langgraph.checkpoint.memory import MemorySaver
 
 from opus_orchestrator.frameworks import get_framework_prompt, StoryFramework
-from opus_orchestrator.utils.llm_sync import LLMClient
+from opus_orchestrator.utils.llm import LLMClient
 from opus_orchestrator.autogen_critique import create_critique_crew