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>

Makefile

@@ -39,8 +39,8 @@ help:
 # Installation
 install:
 	@echo "Installing dependencies..."
-	cd backend && npm install
-	cd frontend && npm install
+	cd backend && bun install
+	cd frontend && bun install
 	@echo "Dependencies installed successfully!"
 
 clean:
@@ -61,7 +61,7 @@ dev:
 
 dev-frontend:
 	@echo "Starting frontend development server..."
-	cd frontend && npm start
+	cd frontend && bun start
 
 dev-backend:
 	@echo "Starting backend development server..."
@@ -73,7 +73,7 @@ build: build-frontend build-backend
 
 build-frontend:
 	@echo "Building frontend for production..."
-	cd frontend && npm run build
+	cd frontend && bun run build
 	@echo "Frontend build complete!"
 
 build-backend:
@@ -86,19 +86,19 @@ test: test-frontend test-backend
 
 test-frontend:
 	@echo "Running frontend tests..."
-	cd frontend && npm test -- --watchAll=false --coverage
+	cd frontend && bun test -- --watchAll=false --coverage
 
 test-backend:
 	@echo "Running backend tests..."
-	cd backend && npm test
+	cd backend && bun test
 
 test-coverage:
 	@echo "Running tests with coverage..."
 	@echo "Backend coverage:"
-	cd backend && npm run test:coverage
+	cd backend && bun run test:coverage
 	@echo ""
 	@echo "Frontend coverage:"
-	cd frontend && npm run test:coverage
+	cd frontend && bun run test:coverage
 
 # Code Quality
 lint: lint-frontend lint-backend
@@ -106,11 +106,11 @@ lint: lint-frontend lint-backend
 
 lint-frontend:
 	@echo "Linting frontend..."
-	cd frontend && npm run lint 2>/dev/null || echo "Frontend linting not configured"
+	cd frontend && bun run lint 2>/dev/null || echo "Frontend linting not configured"
 
 lint-backend:
 	@echo "Linting backend..."
-	cd backend && npx eslint .
+	cd backend && bunx eslint .
 
 # Production
 run: build