**Add Vitest support and migrate frontend tests**

- Added Vitest configuration (`vitest.config.mjs`) for frontend unit testing with a `jsdom` environment.
- Migrated and rewrote key frontend tests (`api.test.js`, `comiclist.test.js`, `comicreader.test.js`, `historytable.test.js`, `router.test.js`, `store.test.js`) to Vitest, improving maintainability.
- Removed `tsconfig.json` and related TypeScript loaders from `webpack` configurations (`webpack.dev.js`, `webpack.prod.js`).
- Adjusted `eslint.config.mjs` to support Vitest tests.
- Updated `package-lock.json` to include Vitest, test utilities (`jsdom`, `@vue/test-utils`), and other associated packages.
- Updated Nginx configuration for better compression on assets (`gzip` adjustments).
- Enhanced `entrypoint.sh` to include first-run library indexing (`--if-empty` argument).
- Simplified the `scan_comics` command with a dedicated test for empty database scans.

This transition improves testing workflows and backend/frontend synergy while removing unused TypeScript dependencies.

cbreader/settings/nginx.conf

@@ -6,6 +6,13 @@ server {
 
     listen 80;
 
+    # nginx compresses only text/html by default, so the bundle and CSS need explicit types.
+    gzip on;
+    gzip_comp_level 6;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml application/wasm;
+    gzip_vary on;
+
     location / {
         proxy_pass http://cbwebreader_django;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -20,4 +27,4 @@ server {
         alias /media/;
     }
 
-}
+}