chore(dependencies): update package.json and poetry.lock to include testing libraries (pytest, pytest-asyncio, pytest-cov) and add coverage support; update .gitignore to exclude coverage files

vitest.config.js

@@ -0,0 +1,18 @@
+import { defineConfig } from "vitest/config";
+import vue from "@vitejs/plugin-vue";
+import path from "path";
+
+export default defineConfig({
+    plugins: [vue()],
+    test: {
+        globals: true,
+        environment: "jsdom",
+        include: ["tests/frontend/**/*.{test,spec}.{js,ts,jsx,tsx}"],
+    },
+    resolve: {
+        alias: {
+            "@": path.resolve(__dirname, "meshchatx", "src", "frontend"),
+        },
+    },
+});
+