feat(singer): add CRUD endpoints for singers

[alikia2x]

Changes

Implement a complete CRUD API for managing singers in the catalog.

• Add GET /v2/singer/:id endpoint for retrieving singer details
• Add POST /v2/singer endpoint for creating new singers (auth required)
• Add PATCH /v2/singer/:id endpoint for updating singer metadata (auth required)
• Add DELETE /v2/singer/:id endpoint for soft-deleting singers (auth required)
• Add Zod schemas for request/response validation in packages/core
• Add E2E tests covering all endpoints
• Add search support for singers

Related

• Closes [Backend] Add CRUD endpoints for singers #47

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: fc6e1ca2-bad1-4eef-a45e-e6b3f8b7504c

📥 Commits

Reviewing files that changed from the base of the PR and between fff3b11 and 620a330.

📒 Files selected for processing (23)

• apps/backend/src/handlers/catalog/singer/create.ts
• apps/backend/src/handlers/catalog/singer/delete.ts
• apps/backend/src/handlers/catalog/singer/get.ts
• apps/backend/src/handlers/catalog/singer/index.ts
• apps/backend/src/handlers/catalog/singer/search.ts
• apps/backend/src/handlers/catalog/singer/update.ts
• apps/backend/src/handlers/index.ts
• apps/backend/src/index.ts
• apps/backend/tests/singer.test.ts
• packages/core/src/modules/catalog/index.ts
• packages/core/src/modules/catalog/singer/container.ts
• packages/core/src/modules/catalog/singer/dto.ts
• packages/core/src/modules/catalog/singer/index.ts
• packages/core/src/modules/catalog/singer/repository.interface.ts
• packages/core/src/modules/catalog/singer/repository.ts
• packages/core/src/modules/catalog/singer/service.ts
• packages/core/src/outbox/processor.ts
• packages/core/src/search/catalog/index.ts
• packages/core/src/search/catalog/singer.ts
• packages/core/src/search/config.ts
• packages/core/tests/integration/SingerRepository.test.ts
• packages/core/tests/unit/SingerSearchService.test.ts
• packages/core/tests/unit/SingerService.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/alikia-47-singers

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