Summary: MostLogin adds key features to product menu

Why It Matters: This change makes it easier for users to see what MostLogin can do.

What Changed:

• A new "Key features" section was added under "Products" in the navigation.
• This new section lists "Multi-account management", "Team collaboration", "Extension integration", and "Automation".
• The "Learn more" link under "Products" was moved to after the new "Key features" section.
• The "Sign up" link now goes to a specific English sign-up page.
• Language links now go to specific language subdomains (e.g., /zh, /ru).
• The "Try these functions" link now goes to a specific English sign-up page.
• A cookie consent banner was added at the bottom of the page.