[CORRUPTED] Synthetic Benchmark PR #29004 - Refactor apps service toward TanStack Query

[ofir-frd]

Benchmark PR langgenius#29004

Type: Corrupted (contains bugs)

Original PR Title: Refactor apps service toward TanStack Query
Original PR Description: ## Summary

• add TanStack Query hooks for apps domain (lists, stats, voices, API keys) with stable query keys and invalidation helpers
• replace SWR usage in app surfaces with the new hooks (overview charts, apps list/nav, plugin app selector, account page, TTS voice config, demo)
• keep promise-based service helpers and drop leftover SWR fetcher typing

Original PR URL: langgenius#29004

Compliance Violation

• Rule: Backend Tests Must Follow Arrange-Act-Assert Structure
• Language: Python
• File: api/tests/unit_tests/services/test_recommended_app_service.py