feat(policy): add Kafka event publishing for policy changes

[poyrazK]

Summary

• Add Kafka event publishing to policy-service with policy.changed event
• Publish events on updateContentPolicy and updateModerationState
• Standard event envelope with contentId, ageRestricted, geoAllowList, geoBlockList, moderationState
• Topic: cloudmedia.policy.changed
• Noop fallback when Kafka is disabled

Test plan

• All policy-service tests passing
• Unit tests for KafkaPolicyEventPublisher
• Integration tests for event publishing in ContentPolicyService

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8f644201-6d12-4f63-b084-e4d78d7a5264

📥 Commits

Reviewing files that changed from the base of the PR and between 63f1654 and 8247acb.

📒 Files selected for processing (15)

• docs/adr/0014-policy-event-publishing.md
• docs/contracts/kafka-event-catalog.md
• docs/modular-implementation-roadmap.md
• services/java/policy-service/pom.xml
• services/java/policy-service/src/main/java/com/cloudmedia/policy/application/ContentPolicyService.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/KafkaPolicyEventPublisher.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/NoopPolicyEventPublisher.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/PolicyChangedPayload.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/PolicyEventEnvelope.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/PolicyEventPublisher.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/PolicyEventsConfiguration.java
• services/java/policy-service/src/main/java/com/cloudmedia/policy/events/PolicyEventsProperties.java
• services/java/policy-service/src/test/java/com/cloudmedia/policy/application/PolicyEventPublisherTest.java
• services/java/policy-service/src/test/java/com/cloudmedia/policy/events/KafkaPolicyEventPublisherTest.java
• services/java/policy-service/src/test/java/com/cloudmedia/policy/events/NoopPolicyEventPublisherTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/content-updated-event

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[poyrazK]

It's okay to merge