feat: introduce dependency injection container with shaku

[unhappychoice]

Summary

This PR introduces a dependency injection (DI) container using shaku v0.6 to improve the codebase architecture and resolves critical deadlock issues.

Key Changes

DI Container Implementation

• Created AppModule in src/presentation/di.rs
• Adopted shaku v0.6 Component/Provider pattern
• Registered all Screen components

Deadlock Fixes

• RecordsScreen (3 locations)

  • render_session_list: Separated read/write lock operations
  • next_item/previous_item: Fixed lock ordering using temporary variables

• AnalyticsScreen (4 locations)

  • next_repository/previous_repository/next_language/previous_language
  • Applied same pattern: read first, then write

• InfoDialogScreen (1 location)

  • handle_key_event: Clone state before matching to avoid nested locks

Test Updates

• Updated to use Arc<dyn EventBusInterface> type
• Fixed type mismatches in info_dialog_test.rs
• Added MockSessionService

Code Quality Improvements

• Removed unused imports (33 locations)
• Fixed clippy warnings (15 auto-fixes)
• Fixed doctest in screen_manager.rs

Test Results

• ✅ All 1439 tests passing
• ✅ 0 warnings
• ✅ 0 clippy warnings

Related Issue

Resolves #304

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/304-introduce-di-container

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[codecov]

Codecov Report

❌ Patch coverage is 58.57066% with 771 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.27%. Comparing base (c829325) to head (19d1e18).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/presentation/tui/screen_manager.rs	2.32%	126 Missing ⚠️
src/presentation/tui/screens/loading_screen.rs	42.42%	57 Missing ⚠️
src/domain/repositories/challenge_repository.rs	0.00%	44 Missing ⚠️
src/presentation/tui/screens/analytics_screen.rs	57.89%	40 Missing ⚠️
src/presentation/tui/screens/typing_screen.rs	79.87%	33 Missing ⚠️
src/infrastructure/storage/file_storage.rs	0.00%	30 Missing ⚠️
src/presentation/tui/screens/records_screen.rs	80.88%	26 Missing ⚠️
...ructure/git/remote/remote_git_repository_client.rs	13.79%	25 Missing ⚠️
src/presentation/tui/screens/settings_screen.rs	76.23%	24 Missing ⚠️
...structure/git/local/local_git_repository_client.rs	21.42%	22 Missing ⚠️
... and 45 more

❌ Your patch check has failed because the patch coverage (58.57%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (73.27%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
- Coverage   74.99%   73.27%   -1.72%     
==========================================
  Files         221      223       +2     
  Lines       21824    22388     +564     
==========================================
+ Hits        16366    16404      +38     
- Misses       5458     5984     +526     

Files with missing lines	Coverage Δ
src/domain/services/analytics_service.rs	80.56% <100.00%> (ø)
.../services/source_code_parser/source_code_parser.rs	94.39% <100.00%> (ø)
...ces/source_file_extractor/source_file_extractor.rs	94.38% <ø> (ø)
src/domain/services/theme_manager.rs	81.52% <100.00%> (ø)
src/infrastructure/database/daos/challenge_dao.rs	80.76% <100.00%> (ø)
src/infrastructure/database/daos/repository_dao.rs	89.83% <100.00%> (+3.38%)	⬆️
src/infrastructure/database/daos/session_dao.rs	97.33% <100.00%> (+1.45%)	⬆️
src/infrastructure/database/daos/stage_dao.rs	100.00% <100.00%> (ø)
src/presentation/cli/commands/repo.rs	0.00% <ø> (ø)
src/presentation/game/context_loader.rs	85.24% <100.00%> (-0.70%)	⬇️
... and 57 more

... and 1 file with indirect coverage changes

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