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)

pyproject.toml

@@ -40,6 +40,13 @@ dependencies = [
 "Documentation" = "https://github.com/kjanat/livegraphsdjango#readme"
 "Source" = "https://github.com/kjanat/livegraphsdjango"
 
+[project.scripts]
+# Django management commands
+livegraphs-manage = "dashboard_project.manage:main"
+livegraphs-migrate = "dashboard_project.__main__:migrate"
+livegraphs-server = "dashboard_project.__main__:runserver"
+livegraphs-shell = "dashboard_project.__main__:shell"
+
 [dependency-groups]
 dev = [
   "bandit>=1.8.3",
@@ -52,6 +59,7 @@ dev = [
   "pytest>=8.3.5",
   "pytest-django>=4.11.1",
   "ruff>=0.11.10",
+  "ty>=0.0.1a25",
 ]
 
 [build-system]
@@ -165,4 +173,9 @@ line-ending = "lf"
 packages = ["dashboard_project"]
 
 [tool.setuptools.package-data]
-"dashboard_project" = ["static/__/*", "templates/__/*", "media/**/*"]
+"dashboard_project" = [
+  "static/**/*",
+  "templates/**/*",
+  "media/**/*",
+  "py.typed"
+]