Changelog

• Added DeepSeek integration with JSON build plans and strict response handling.
• Implemented region selection (stick LMB/RMB) with live outline preview and drag‑select.
• Added streaming output, progressive block placement, and build‑during‑stream for chat model.
• Added validation/repair pipeline with retry and continuation for partial plans.
• Introduced history memory with /feedback and /next continuation flow.
• Added survival mode block consumption and AI bot NPC commands.
• Added style presets + example blueprints for higher‑quality builds.
• Improved logging, error handling, and English localization for messages/configs.