feat: complete monorepo structure with frontend and shared resources

- Add complete backend/ directory with full Django application
- Add frontend/ directory with Vite + TypeScript setup ready for Next.js
- Add comprehensive shared/ directory with:
  - Complete documentation and memory-bank archives
  - Media files and avatars (letters, park/ride images)
  - Deployment scripts and automation tools
  - Shared types and utilities
- Add architecture/ directory with migration guides
- Configure pnpm workspace for monorepo development
- Update .gitignore to exclude .django_tailwind_cli/ build artifacts
- Preserve all historical documentation in shared/docs/memory-bank/
- Set up proper structure for full-stack development with shared resources

shared/docs/memory-bank/testing/migration-cleanup-progress.md

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+# Migration Cleanup Progress Report
+
+**Date**: 2025-01-07  
+**Status**: ✅ CRITICAL MIGRATION REFERENCES FIXED  
+
+## Completed Fixes
+
+### 1. Migration References ✅ FIXED
+- **Fixed**: `parks/migrations/0001_initial.py:70` - Changed `companies.company` to `operators.operator`
+- **Fixed**: `rides/migrations/0003_history_tracking.py:209` - Changed `companies.manufacturer` to `manufacturers.manufacturer`
+
+### 2. Test Runner Configuration ✅ UPDATED
+- **Fixed**: `tests/test_runner.py` - Removed `companies` references
+- **Added**: New entity apps (`operators`, `manufacturers`, `property_owners`) to:
+  - MIGRATION_MODULES configuration
+  - Coverage source configuration  
+  - Test labels for discovery
+
+## Test Results
+
+### Database Creation ✅ SUCCESS
+```
+Creating test database for alias 'default' ('test_thrillwiki')...
+Operations to perform:
+  Synchronize unmigrated apps: [list of apps]
+  Apply all migrations: account, accounts, admin, analytics, auth, contenttypes, core, designers, email_service, history_tracking, location, manufacturers, media, moderation, operators, parks, pghistory, property_owners, reviews, rides, sessions, sites, socialaccount
+```
+
+**All migrations applied successfully** - No more `ValueError: Related model 'companies.company' cannot be resolved`
+
+### Test Execution Status
+- ✅ Test database creation works
+- ✅ Migration system functional
+- ❌ Individual tests failing due to outdated test code
+
+## Remaining Issues
+
+### Test Code Updates Needed
+**Error Pattern**: `TypeError: Park() got unexpected keyword arguments: 'owner'`
+
+**Root Cause**: Test files still reference old field names:
+- Tests use `owner` parameter but Park model now uses `operator`
+- Need to update test fixtures and assertions
+
+**Files Requiring Updates**:
+- `parks/tests/test_models.py` - Update Park creation to use `operator` instead of `owner`
+- Other test files may have similar issues
+
+## Success Criteria Met
+
+✅ **Primary Goal Achieved**: `uv run manage.py test` can now start without critical import/migration errors  
+✅ **Migration References**: All broken references to `companies` app resolved  
+✅ **Test Infrastructure**: Test runner configuration updated for new entity structure  
+
+## Next Steps (Out of Scope)
+
+The following would be needed for full test functionality but are beyond the current task scope:
+1. Update individual test files to use new field names (`operator` vs `owner`)
+2. Update test fixtures and factory methods
+3. Validate all test assertions work with new entity relationships
+
+## Conclusion
+
+**MISSION ACCOMPLISHED**: The critical migration cleanup is complete. The test suite infrastructure is now functional and can create test databases without errors. The remaining test failures are due to outdated test code using old field names, which is a separate concern from the migration system repair.