feat(i18n): Internationalize marketing pages and components
- HomePage.tsx: Add translation keys for features, testimonials, section titles
- FeaturesPage.tsx: Add translation keys for automation engine, multi-tenancy sections
- Hero.tsx: Add translation keys for headline, CTAs, trust signals, visual content
- ContactPage.tsx: Add translation keys for form headings, success messages
- PricingPage.tsx: Add translation keys for FAQ section
- PrivacyPolicyPage.tsx: Full internationalization of 15-section privacy policy
- TermsOfServicePage.tsx: Full internationalization of 16-section terms of service
- Footer.tsx & Navbar.tsx: Add translation keys for brand name, aria-labels
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Co-Authored-By: Claude <noreply@anthropic.com>
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