feat: implement CI workflow, enhance file validation, and add test cases

- Introduced a CI workflow for automated testing of backend and frontend components.
- Added pytest configuration for backend tests and Vitest configuration for frontend tests.
- Enhanced file validation logic in the backend to improve error handling and reporting.
- Created comprehensive test cases for various validation scenarios, including edge cases and incorrect formats.
- Updated requirements to include necessary testing libraries and tools.

frontend/vitest.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vitest/config'
+import { fileURLToPath } from 'node:url'
+import { dirname, resolve } from 'node:path'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = dirname(__filename)
+const repoRoot = resolve(__dirname, '..')
+
+export default defineConfig({
+  server: {
+    fs: {
+      allow: ['..']
+    }
+  },
+  test: {
+    environment: 'jsdom',
+    include: [resolve(repoRoot, 'tests/frontend/**/*.spec.ts')],
+    globals: true
+  }
+})
+