refactor(backend): clean up models setup, improve ip utils, add adr docs

- Extract ADR documents for architectural decisions (SQLite, FastAPI, React, APScheduler, Scheduler)
- Refactor setup.py: improve code structure and readability
- Add IP validation utilities with test coverage
- Update frontend components (BanTable, HistoryPage)
- Add pre-commit hooks and CONTRIBUTING.md
- Add .editorconfig for consistent coding standards

frontend/package.json

@@ -46,6 +46,7 @@
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^5.0.0",
+    "husky": "^9.1.7",
     "jiti": "^2.6.1",
     "jsdom": "^28.1.0",
     "openapi-typescript": "^7.13.0",