Add core service infrastructure

- NATS event bus (pub/sub, JetStream, KV storage)
- Service registry with health monitoring
- Base service class with lifecycle management
- Config system
- Logger with Vi formatting

Adapted from Lyra's patterns, namespace changed to vi.*

🦊💕

config/config.json

@@ -0,0 +1,11 @@
+{
+  "nats": {
+    "url": "nats://daemoness.local:4222",
+    "connection_timeout": 30,
+    "max_reconnect_attempts": 10
+  },
+  "services": {
+    "heartbeat_timeout": 60,
+    "health_check_interval": 30
+  }
+}