feat: add ty type checking support and fix type issues

- Add ty.toml configuration with Django project root
- Add py.typed marker for type checking
- Fix type issues across codebase:
  - Add type ignore comments for redis.exceptions imports
  - Fix django.db.models.functions imports in utils
  - Fix getattr usage in accounts/forms
  - Remove unnecessary type annotations in dashboard/forms
- Configure ty to exclude migrations and respect ignore files
- All ty checks now pass (29 diagnostics -> 0)

uv.lock

@@ -563,6 +563,7 @@ dev = [
     { name = "pytest" },
     { name = "pytest-django" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 
 [package.metadata]
@@ -599,6 +600,7 @@ dev = [
     { name = "pytest", specifier = ">=8.3.5" },
     { name = "pytest-django", specifier = ">=4.11.1" },
     { name = "ruff", specifier = ">=0.11.10" },
+    { name = "ty", specifier = ">=0.0.1a25" },
 ]
 
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 ]
 
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 name = "types-pyyaml"
 version = "6.0.12.20250915"