Clean up test files and debug artifacts, add node_modules to gitignore, export DashboardManager for testing, and enhance pytest configuration with comprehensive test markers and settings

Makefile

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+# Makefile for Homelab Automation Dashboard - Test Commands
+# ==========================================================
+
+.PHONY: help test test-backend test-frontend test-all test-cov install-test-deps lint
+
+# Default target
+help:
+	@echo "Homelab Automation Dashboard - Test Commands"
+	@echo "============================================="
+	@echo ""
+	@echo "Usage: make <target>"
+	@echo ""
+	@echo "Targets:"
+	@echo "  install-test-deps  Install all test dependencies (Python + Node.js)"
+	@echo "  test-backend       Run backend Python tests"
+	@echo "  test-frontend      Run frontend JavaScript tests"
+	@echo "  test-all           Run all tests (backend + frontend)"
+	@echo "  test-cov           Run all tests with coverage reports"
+	@echo "  test-watch         Run tests in watch mode"
+	@echo "  lint               Run linters (if configured)"
+	@echo ""
+
+# Install test dependencies
+install-test-deps:
+	@echo "Installing Python test dependencies..."
+	pip install pytest pytest-asyncio pytest-cov httpx respx freezegun pytest-mock
+	@echo ""
+	@echo "Installing Node.js test dependencies..."
+	npm install
+	@echo ""
+	@echo "✅ All test dependencies installed"
+
+# Backend tests only
+test-backend:
+	@echo "Running backend tests..."
+	pytest tests/backend -v --tb=short -m "unit"
+
+# Backend tests with coverage
+test-backend-cov:
+	@echo "Running backend tests with coverage..."
+	pytest tests/backend -v --tb=short --cov=app --cov-report=html --cov-report=term-missing
+
+# Frontend tests only
+test-frontend:
+	@echo "Running frontend tests..."
+	npm test
+
+# Frontend tests with coverage
+test-frontend-cov:
+	@echo "Running frontend tests with coverage..."
+	npm run test:coverage
+
+# All tests
+test-all: test-backend test-frontend
+	@echo ""
+	@echo "✅ All tests completed"
+
+# All tests with coverage
+test-cov: test-backend-cov test-frontend-cov
+	@echo ""
+	@echo "✅ All tests completed with coverage"
+	@echo "Backend coverage: htmlcov/index.html"
+	@echo "Frontend coverage: coverage/index.html"
+
+# Watch mode (frontend only - uses Vitest watch)
+test-watch:
+	npm run test:watch
+
+# Quick test (fast subset)
+test-quick:
+	pytest tests/backend -v --tb=short -m "unit" -x -q
+	npm test -- --run
+
+# Integration tests
+test-integration:
+	pytest tests/backend -v --tb=short -m "integration"
+
+# Clean test artifacts
+clean-test:
+	@echo "Cleaning test artifacts..."
+	rm -rf .pytest_cache __pycache__ htmlcov coverage .coverage
+	rm -rf tests/backend/__pycache__ tests/frontend/__pycache__
+	@echo "✅ Test artifacts cleaned"