fix: comprehensive error handling, UI fixes, and transaction protection

refactor: restructure views into mixin-based architecture

feat: add per-section breakdown to ice usage endpoint and remove redundant ruff config

cleanup: remove obsolete code and unused fields

feat: migrate from TypedDict to Pydantic for type safety

feat: add uv.lock for reproducible Docker deployments

fix: replace ThreadPoolExecutor with SynchronousExecutor for SQLite compatibility

fix: replace parallel ThreadPoolExecutor with single-worker serial execution

fix: disable threading in test environment for SQLite compatibility

fix: disable parallel test execution for SQLite

feat: complete Wall Construction API with nested progress endpoint and HuggingFace deployment

feat: implement multi-threaded cost aggregation and bulk endpoint

feat: implement repository layer and cost-overview endpoint

feat: implement daily-ice-usage endpoint for Profile API

feat: add DailyProgress API with auto-calculation

feat: add DailyProgress model and IceUsageCalculator service

feat: implement TDD for Wall Construction API with full type safety