Refactor: 重构会话和模型控制区域样式，优化按钮和状态文本布局

Refactor UI: Group session tabs with model selector

Refactor: Move session tab bar structure to HTML

Modularize frontend CSS and JavaScript assets

Refactor and enhance Gemini proxy and documentation

feat: Delegate Mermaid rendering to Marked.js

Enhance logging and memory metrics; fix UI link

Simplify memory metrics output and update Hugging Face badge

feat: Add API call retries and UI loading indicator

feat: Improve metrics and display call records

feat: Enhance Markdown rendering and bot message image display

Feat: Render Markdown and Mermaid in chat messages

Refactor: Improve input area layout and update model options

Refine input area and button styles

Update memory metric and refine UI layout

feat: Implement memory usage tracking and optimize Docker build

feat: Refactor Gemini proxy with native types; add Chinese license

feat: Implement multi-model selection and image input

Refactor: Enhance UI, improve documentation, and streamline setup

feat: Enhance UI layout and visual design

Initial project setup