Fix Comic Hub CI npm install hang

Two changes:

- Add engines.node >=20.9 to comic-hub/package.json. Matches Next.js 16
  minimum and prevents accidental installs on unsupported runtimes.

- Add 'npm cache clean --force' step before 'npm ci' in the Comic Hub
  workflow. Two consecutive CI runs failed at npm ci with
  'npm error Exit handler never called!' (npm/cli#8336) — a known npm 11
  bug triggered by stale/corrupt cache state. The setup-node@v6
  cache: 'npm' directive restores cache between runs, so a corrupt entry
  poisons subsequent runs. Clean cache step forces fresh fetch.

Author: KKDad

.github/workflows/angular.yml

@@ -34,6 +34,9 @@ jobs:
         cache: 'npm'
         cache-dependency-path: comic-hub/package-lock.json
 
+    - name: Clean npm cache
+      run: npm cache clean --force
+
     - name: Install dependencies
       run: npm ci
 

comic-hub/package.json

@@ -2,6 +2,9 @@
   "name": "comic-hub",
   "version": "0.1.0",
   "private": true,
+  "engines": {
+    "node": ">=20.9"
+  },
   "scripts": {
     "dev": "next dev",
     "build": "next build",