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Add TeamInvite model for team join invitations
Create app 'teams': update: task_manager/settings.py create: task_manager/teams/__init__.py create: task_manager/teams/admin.py create: task_manager/teams/apps.py create: task_manager/teams/migrations/__init__.py create: task_manager/teams/models.py create: task_manager/teams/tests.py create: task_manager/teams/urls.py create: task_manager/teams/views.py update: task_manager/urls.py
Add helper methods to TeamJoinForm and expand test coverage
Add comprehensive test suite for team invite functionality