chore(repo): rework github pipelines

[SahilKumar75]

What changed

• Reworked app, backend, and ML worker CI workflows with push, pull request, and manual triggers.
• Consolidated the duplicate ML worker workflow into one matrix test workflow.
• Updated PR labeling, PR validation, and label setup workflows to match the current repo flow.
• Added app package scripts for type checking and web bundle verification.
• Restored backend verification by implementing timetable batch deletion and updating stale backend tests.

Why

• The existing pipelines were split unevenly, duplicated ML worker test coverage, and did not run consistently on main updates.
• The PR validator was closing PRs and did not accept the current branch workflow.
• The backend workflow exposed compile and test drift that needed to be fixed for CI to stay useful.

How to test

• ruby -e 'require "yaml"; Dir[".github/workflows/*.yml"].each { |file| YAML.load_file(file) }'
• npm run lint
• npm run typecheck
• npm run build:web
• pytest
• JAVA_HOME=/opt/homebrew/Cellar/openjdk/25.0.2/libexec/openjdk.jdk/Contents/Home mvn -B verify
• relates to Refine Hangout meeting shell toward production-quality room UX #6

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a625de0e-ae68-4cfe-b5c1-a45e080f7e3c

📥 Commits

Reviewing files that changed from the base of the PR and between 0553d2f and c6637d5.

📒 Files selected for processing (15)

• .github/workflows/auto-label-pr.yml
• .github/workflows/ci-app.yml
• .github/workflows/ci-backend.yml
• .github/workflows/ci-ml-worker.yml
• .github/workflows/ml-worker.yml
• .github/workflows/pr-validator.yml
• .github/workflows/setup-labels.yml
• app/package.json
• backend/src/main/java/com/sentri/backend/service/TimetableBatchServiceImpl.java
• backend/src/test/java/com/sentri/backend/controller/IntelligenceControllerTest.java
• backend/src/test/java/com/sentri/backend/controller/MyspaceGraphControllerTest.java
• backend/src/test/java/com/sentri/backend/controller/MyspaceItemControllerTest.java
• backend/src/test/java/com/sentri/backend/service/AuthServiceTest.java
• backend/src/test/java/com/sentri/backend/service/HangoutRoomServiceTest.java
• backend/src/test/java/com/sentri/backend/service/TimetableBatchServiceTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/repo/rework-pipelines

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