feat(content): add draft-to-published workflow endpoint

[poyrazK]

Summary

• add POST /v1/content/{contentId}/publish with a dedicated request DTO and standard API envelope
• enforce publish rules in content-service: channel membership, DRAFT state requirement, and playbackReady=true guard
• add controller/service coverage for publish success, non-member access denial, and conflict paths (CONTENT_NOT_READY, CONTENT_STATE_INVALID), and document contract updates

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: 15399ecd-28d6-44f3-b96d-d1c44ebb5f1e

📥 Commits

Reviewing files that changed from the base of the PR and between 7516a6c and 7aaabea.

📒 Files selected for processing (6)

• docs/contracts/rest-api-v1.md
• services/java/content-service/src/main/java/com/cloudmedia/content/api/content/ContentController.java
• services/java/content-service/src/main/java/com/cloudmedia/content/api/content/dto/PublishContentRequest.java
• services/java/content-service/src/main/java/com/cloudmedia/content/application/content/ContentService.java
• services/java/content-service/src/test/java/com/cloudmedia/content/api/content/ContentControllerWebMvcTest.java
• services/java/content-service/src/test/java/com/cloudmedia/content/application/content/ContentServiceIntegrationTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/content-publish-workflow-v2

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