Simplify Quartz cache key naming

Use quartz-1, quartz-2, etc. for cache invalidation. The actual Quartz
version is determined by the mirror repo, not this key.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.forgejo/workflows/build-blumeops.yaml

@@ -41,13 +41,14 @@ jobs:
         uses: actions/checkout@v4
 
       # Cache Quartz installation (clone + node_modules)
-      # Key includes Quartz version; bump suffix to invalidate cache
+      # Quartz version is determined by the mirror (forge.ops.eblu.me/eblume/quartz)
+      # Bump the cache key number to invalidate (e.g., after mirror update)
       - name: Restore Quartz cache
         id: cache-quartz
         uses: actions/cache@v4
         with:
           path: /tmp/quartz
-          key: quartz-v4.0.8-1
+          key: quartz-1
 
       - name: Setup Quartz
         if: steps.cache-quartz.outputs.cache-hit != 'true'