Doubao Support & Platform Update

Added Doubao (豆包) watermark removal and updated platform accuracy.

What's Changed

• •New: Doubao (豆包) "豆包AI生成" watermark removal via Reverse Screen Blending
• •New: Google AI Studio dedicated landing page
• •New: Blog with SEO-optimized articles
• •New: How-to-use tutorial page
• •New: 8-language i18n support
• •New: Chrome extension for auto watermark removal
• •Updated: Midjourney page converted to informational guide (MJ has no visible watermark)
• •Improved: FAQ content with more keyword-targeted questions
• •Improved: JSON-LD structured data for better search visibility
• •Fixed: Sitemap base URL now defaults to pixelcleanai.com