feat: Complete case edit functionality and Docker setup

- Fix case edit form data handling (POST requests now work correctly)
- Add comprehensive Docker setup with Dockerfile and docker-compose.yml
- Fix CSV import validation for client and case data
- Improve import error handling and column mapping
- Add .dockerignore for efficient Docker builds
- Complete end-to-end testing of full application workflow

All core functionality from del.plan.md now implemented and tested:
✅ Case view, edit, close, and reopen operations
✅ Data import from CSV files with validation
✅ Authentication and session management
✅ Dashboard with search and pagination
✅ Production-ready Docker containerization

.dockerignore

@@ -1,21 +1,54 @@
+# Version control
 .git
 .gitignore
-__pycache__/
-*.py[cod]
-*.so
-*.egg
-*.egg-info/
-.venv/
-env/
-venv/
-build/
-dist/
-node_modules/
-.DS_Store
-.env
-.env.*
-delphi.db
-cookies.txt
-data-import/*
-!data-import/.gitkeep
 
+# Python
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+env
+pip-log.txt
+pip-delete-this-directory.txt
+.tox
+.coverage
+.coverage.*
+.pytest_cache
+nosetests.xml
+coverage.xml
+*.cover
+*.log
+.venv
+venv/
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Documentation
+README.md
+TODO.md
+*.md
+
+# Old data directories (not needed in container)
+old-csv/
+old-database/
+
+# Logs
+*.log
+
+# Temporary files
+*.tmp