feat(content): publish content.published lifecycle events

[poyrazK]

Summary

• add content-service event publisher foundation with Kafka-backed and no-op implementations, plus topic/config wiring
• emit content.published envelope+payload after successful publish transitions in content-service
• add integration/unit coverage for event emission behavior and envelope shape; update REST contract note for publish event output

Verification

• mvn -pl content-service spotless:apply checkstyle:check
• mvn -pl content-service test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c829e487-2152-4819-b816-b2a86385f436

📥 Commits

Reviewing files that changed from the base of the PR and between 90830ad and 8e3ba0c.

📒 Files selected for processing (13)

• docs/contracts/rest-api-v1.md
• services/java/content-service/pom.xml
• services/java/content-service/src/main/java/com/cloudmedia/content/application/content/ContentService.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/ContentEventEnvelope.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/ContentEventPublisher.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/ContentEventsConfiguration.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/ContentEventsProperties.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/ContentPublishedPayload.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/KafkaContentEventPublisher.java
• services/java/content-service/src/main/java/com/cloudmedia/content/events/NoopContentEventPublisher.java
• services/java/content-service/src/main/resources/application.yml
• services/java/content-service/src/test/java/com/cloudmedia/content/application/content/ContentServiceIntegrationTest.java
• services/java/content-service/src/test/java/com/cloudmedia/content/events/KafkaContentEventPublisherTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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