Add Oracle service - LLM wrapper

First service for Vi's nervous system:
- Oracle service with NATS integration
- vLLM backend for Qwen3-32B
- GPTQ quantization support
- Thinking mode sampling configs

Simplified from Lyra's patterns, ready to test.

🦊✺

services/oracle/__init__.py

@@ -0,0 +1,4 @@
+# Oracle Service - LLM wrapper for Vi
+from .oracle_service import OracleService, oracle_service
+
+__all__ = ['OracleService', 'oracle_service']