ci: optimize workflows to prevent conflicts

build.yml changes:
- Remove 'on: push' trigger (conflicted with deploy.yml)
- Keep manual dispatch only
- Prevent unnecessary workflow runs
- Save GitHub Actions minutes

Workflow strategy:
- build.yml: Generate file lists (manual)
- deploy.yml: Deploy to Pages (manual)
- celebration-2026.yml: Auto-deploy on 2026 (scheduled)

All workflows now non-conflicting ✅

Author: sandikodev

.github/workflows/build.yml

@@ -1,9 +1,7 @@
-name: Build and Deploy
+name: Generate File Lists
 
 on:
-  push:
-    branches: [ main ]
-  workflow_dispatch:
+  workflow_dispatch:  # Manual trigger only
 
 permissions:
   contents: write
@@ -29,7 +27,7 @@ jobs:
         git config --local user.email "github-actions[bot]@users.noreply.github.com"
         git config --local user.name "github-actions[bot]"
         git add content/files.json docs/files.json
-        git diff --quiet && git diff --staged --quiet || git commit -m "Auto-generate file lists"
+        git diff --quiet && git diff --staged --quiet || git commit -m "chore: auto-generate file lists"
     
     - name: Push changes
       uses: ad-m/github-push-action@master