Content service: content listing, thumbnail support, and visibility filtering

[poyrazK]

Summary

• Add GET /v1/channels/{channelId}/content endpoint for listing channel content
• Add thumbnail_url column and DTO support for content thumbnails
• Add visibility filtering (PRIVATE content excluded from public listings)
• Add explicit ORDER BY for deterministic content ordering
• Fix N+1 query with @EntityGraph eager loading
• Add URL validation for thumbnail updates
• Add comprehensive tests for content listing

Test plan

• All 52 tests pass
• Checkstyle and Spotless checks pass
• API contract updated in docs

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5a0a8059-d793-4af6-b5a3-183d8005d660

📥 Commits

Reviewing files that changed from the base of the PR and between d04ef8a and 0116d39.

📒 Files selected for processing (14)

• .markdownlint.json
• docs/adr/0013-content-listing-thumbnail.md
• docs/contracts/rest-api-v1.md
• docs/modular-implementation-roadmap.md
• services/java/content-service/src/main/java/com/cloudmedia/content/api/channel/ChannelController.java
• services/java/content-service/src/main/java/com/cloudmedia/content/api/content/dto/ContentResponse.java
• services/java/content-service/src/main/java/com/cloudmedia/content/api/content/dto/UpdateContentRequest.java
• services/java/content-service/src/main/java/com/cloudmedia/content/application/content/ContentService.java
• services/java/content-service/src/main/java/com/cloudmedia/content/persistence/entity/ContentEntity.java
• services/java/content-service/src/main/java/com/cloudmedia/content/persistence/repository/ContentRepository.java
• services/java/content-service/src/main/resources/db/migration/V3__add_content_thumbnail.sql
• services/java/content-service/src/test/java/com/cloudmedia/content/api/channel/ChannelContentControllerWebMvcTest.java
• services/java/content-service/src/test/java/com/cloudmedia/content/application/content/ContentServiceIntegrationTest.java
• services/java/content-service/src/test/java/com/cloudmedia/content/persistence/repository/ContentRepositoryTest.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