Enhance aethex-bot/public/features.html and aethex-bot/public/pricing.html to visually represent the new tiered access model, including new CSS classes and HTML structures for feature and pricing tiers.
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Add comprehensive SEO meta tags, Open Graph, Twitter Cards, JSON-LD, canonical URLs, keywords, robots.txt, and sitemap.xml to all public pages, and apply noindex to the dashboard.
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Replaced `.single()` with `.maybeSingle()` in multiple command files to handle cases where no record is found, and added a new /pricing route and navigation links to the UI.
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