chore: add project-wide .gitignore for Angular, Django/Python, Docker, and generated exam data

.gitignore

@@ -0,0 +1,70 @@
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Node / Angular
+node_modules/
+**/node_modules/
+dist/
+**/dist/
+build/
+**/build/
+.tmp/
+.ng/
+.angular/
+coverage/
+
+# Python
+__pycache__/
+**/__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+*.egg-info/
+.eggs/
+.venv/
+venv/
+env/
+ENV/
+
+# Django / SQLite
+*.sqlite3
+**/db.sqlite3
+exam_system/exam_server/db/
+
+# Env / Secrets
+.env
+.env.*
+*!/.env.example
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# IDE / Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Docker
+**/.docker/
+**/docker/*.env
+
+# Cache
+.cache/
+**/.cache/
+
+# Exam system generated data
+exam_system/data/output/
+exam_system/data/attempts/
+
+# Angular app extras
+exam_system/exam_web/.angular/
+exam_system/exam_web/dist/
+