fix: version bump 0.3.2, remove debug log, dynamic /api version, Pro plan 5000 PDFs

1. Version bump to 0.3.2
2. Remove debug console.log('CACHE HIT:') from static asset middleware
3. /api endpoint: hardcoded version → dynamic from package.json
4. OpenAPI docs + terms: Pro plan 10,000 → 5,000 PDFs/month
5. Remove .backup files

public/terms.html

@@ -98,7 +98,7 @@ footer .container { display: flex; justify-content: space-between; align-items:
     <h3>2.2 Pro Tier</h3>
     <ul>
       <li><strong>Price:</strong> €9 per month</li>
-      <li><strong>Monthly limit:</strong> 10,000 PDF conversions</li>
+      <li><strong>Monthly limit:</strong> 5,000 PDF conversions</li>
       <li><strong>Rate limit:</strong> Higher limits based on fair use</li>
       <li><strong>Support:</strong> Priority email support (<a href="mailto:support@docfast.dev">support@docfast.dev</a>)</li>
       <li><strong>Billing:</strong> Monthly subscription via Stripe</li>