feat: Added type checking infrastructure and fix type errors

Overview

Added static type checking with mypy and resolved 105+ type errors across the codebase.

Changes Made

Type Checking Setup

• Installed and configured mypy as the type checker
• Created mypy.ini with appropriate settings for the project
• Added type stubs: types-openpyxl, types-python-dateutil, types-pytz, pandas-stubs, types-reportlab

Type Annotations Added

• Projects/file_classifier.py: Added dict[str, int] type for counts
• modes/team_leaderboard.py: Added dict[str, int] type for activity_map
• gitlab_utils/client.py: Fixed _ZERO_ROW type with dict[str, Any]

Import Issues Fixed

• Projects/ directory: Renamed files to match imports
  • complicance_checks.py → compliance_checks.py
  • compliance_Service.py → compliance_service.py
  • template_checker.py → templates_checker.py
• Created Projects/__init__.py to make it a proper package
• Removed reference to non-existent vscode_checker

None Handling Fixed

• gitlab_utils/client.py: Fixed closed_at access with default empty string
• modes/team_leaderboard.py: Fixed None handling in string operations using or ""

Type Mismatches Fixed

• scripts/generate_report.py: Changed elements list type to list[Flowable]
• Added Flowable import from reportlab.platypus

Missing Functions Added

• batch_mode/batch_service.py: Added process_single_project() stub
• batch_mode/export_service.py: Added prepare_export_data() function
• user_profile/profile_utils.py: Added split_projects() function

Configuration Updates

• Updated pyproject.toml: Added N999 to ruff ignore list for 'Projects' directory
• Created mypy.ini: Configured ignore_missing_imports for libraries without stubs

Testing

• ruff check . - ✅ All checks passed
• mypy . - ✅ Success - no issues found in 87 source files

Notes

• The Projects/ directory uses uppercase naming which triggers ruff N999; ignored via configuration
• Some third-party libraries (nest_asyncio, xlsxwriter) don't have type stubs; configured mypy to skip them