feat: replace npm with bun throughout project

- Update Makefile to use bun for all commands (install, build, test, lint)
- Update frontend package.json scripts to support bun
- Update documentation references from npm to bun
- Add bun lockfiles for both frontend and backend
- Remove react-leaflet-cluster dependency conflict
- Update migration scripts to use bun instead of node
- Frontend and backend now fully use bun runtime

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

frontend/jest.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  setupFilesAfterEnv: ['<rootDir>/src/setupTests.js'],
+  moduleNameMapping: {
+    '^axios$': 'axios/dist/node/axios.cjs',
+  },
+  testEnvironment: 'jsdom',
+  transformIgnorePatterns: [
+    'node_modules/(?!(axios|@react-leaflet|leaflet|react-leaflet)/)',
+  ],
+};