fix: replace stale Free Tier with Demo tier in Terms of Service

- Section 2.1: Replace Free Tier with Demo (Free) - no account required,
  5 req/hour, testing and evaluation only, no SLA/support
- Section 5.1: Change 'no SLA for free tier' to 'no SLA for demo usage'
- Add terms-content test to verify no Free Tier references remain
- Rebuild public/terms.html via build-html.cjs

src/__tests__/examples-http-only.test.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest';
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+describe('examples.html - Go and PHP use plain HTTP examples', () => {
+  const html = readFileSync(join(__dirname, '../../public/examples.html'), 'utf-8');
+
+  it('does NOT contain the fake Go SDK import', () => {
+    expect(html).not.toContain('github.com/docfast/docfast-go');
+  });
+
+  it('does NOT contain the fake PHP SDK class', () => {
+    expect(html).not.toContain('DocFast\\Client');
+  });
+
+  it('does NOT contain the fake Laravel facade', () => {
+    expect(html).not.toContain('DocFast\\Laravel');
+  });
+
+  it('contains Go net/http example', () => {
+    expect(html).toContain('net/http');
+  });
+
+  it('contains PHP file_get_contents example', () => {
+    expect(html).toContain('file_get_contents');
+  });
+});