feat: event bus with Redpanda + AI insight consumer

- EventBusService: Kafka/Redpanda pub/sub with kafkajs, graceful fallback when broker unavailable
- Topics: call.completed, call.missed, agent.state
- AiInsightConsumer: on call.completed, fetches lead activity → OpenAI generates summary + suggested action → updates Lead entity on platform
- Disposition endpoint emits call.completed event after Ozonetel dispose
- EventsModule registered as @Global for cross-module injection
- Redpanda container added to VPS docker-compose
- Docker image rebuilt for linux/amd64 with kafkajs dependency

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/events/event-types.ts

@@ -0,0 +1,36 @@
+// Event topic names
+export const Topics = {
+    CALL_COMPLETED: 'call.completed',
+    CALL_MISSED: 'call.missed',
+    AGENT_STATE: 'agent.state',
+} as const;
+
+// Event payloads
+export type CallCompletedEvent = {
+    callId: string | null;
+    ucid: string;
+    agentId: string;
+    callerPhone: string;
+    direction: string;
+    durationSec: number;
+    disposition: string;
+    leadId: string | null;
+    notes: string | null;
+    timestamp: string;
+};
+
+export type CallMissedEvent = {
+    callId: string | null;
+    callerPhone: string;
+    leadId: string | null;
+    leadName: string | null;
+    timestamp: string;
+};
+
+export type AgentStateEvent = {
+    agentId: string;
+    state: string;
+    timestamp: string;
+};
+
+export type EventPayload = CallCompletedEvent | CallMissedEvent | AgentStateEvent;