feat: add strict mypy type-checking for app/utils/ module

- Add [[tool.mypy.overrides]] section for app/utils/** with disallow_untyped_defs=true
- Add type annotations to all functions in app/utils/ (12 files)
- Fix type annotations in app/config.py and app/database.py (imported by utils)
- All 85 source files now pass mypy type checking

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

pyproject.toml

@@ -194,6 +194,12 @@ disable_error_code = [
     "call-arg",         # Dynamic call signatures in framework code
 ]
 
+# Stricter type-checking for utility modules
+[[tool.mypy.overrides]]
+module = "app.utils.*"
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+
 # Coverage configuration
 [tool.coverage.run]
 source = ["app"]