Update landing pricing and brand name in policy pages

[SaravanakumarR2018]

Motivation

• Provide a clear, professional pricing section on the landing page with three distinct packs (Starter, Pro, Enterprise) and concise feature lists.
• Make legal pages explicitly reference the correct service name so users know the policies apply to the product.
• Align on-brand wording across the site to reduce ambiguity for customers.

Description

• Replaced the pricing teaser with a three-card pricing layout in src/frontend/src/pages/LandingPage/index.tsx featuring a Starter Pack ($20 USD, 7-day trial), Pro Pack ($50 USD, no trial), and Enterprise Pack (contact sales).
• Added itemized feature bullets and updated CTAs for each pricing card in the landing page.
• Updated Terms of Service, Privacy Policy, and Refund Policy pages to reference Visual AI Agents Builder in src/frontend/src/pages/TermsOfServicePage/index.tsx, src/frontend/src/pages/PrivacyPolicyPage/index.tsx, and src/frontend/src/pages/RefundPolicyPage/index.tsx.
• Adjusted footer branding text on the landing page to Visual AI Agents Builder.

Testing

• No automated tests were run on these changes in this rollout.

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Codex Task