feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

services/agent-runtime/config.yaml

@@ -0,0 +1,23 @@
+nats:
+  servers: ["nats://nats:4222"]
+  invocation_subject: "router.invoke.agent"
+
+services:
+  messaging: "http://messaging-service:7004"
+  agent_memory: "http://agent-memory:7008"
+  llm_proxy: "http://llm-proxy:7007"
+  agents: "http://agents-service:7009"
+
+llm:
+  default_model: "gpt-4"
+  max_tokens: 1000
+  temperature: 0.7
+  timeout: 30
+
+memory:
+  query_top_k: 5
+  enable_writeback: true
+
+
+
+