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

Fallback to transparent GIF for failed image proxy

Force clear current session key on init

feat: Display new session in tabs immediately

Enhance session loading and error handling

feat: Implement local session fallback for new sessions

feat: Generate default session name for new sessions

Add debug logs for session management initialization

Add temporary debug log for login form setup

Redirect to main page after successful login

Refactor: Streamline session initialization flow

Refine login success and enhance session creation logging

Fix: Initialize session management on root path

Refactor session tab management to separate rendering and reduce fetches

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Based on the git diff, here's the commit message:

Ensure current session history is loaded during initialization

Add session history API and auto-init session management

Refactor UI: Group session tabs with model selector

Refine CSS positioning for improved layout and context

Force static positioning for session container

Refactor: Move session tab bar structure to HTML

Modularize frontend CSS and JavaScript assets

Feat: Redesign session management to use tabs

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Feat: Improve image loading and authentication handling

将所有API Key相关表述和变量名称调整为认证令牌

修复图片显示问题：移除红框并添加后端图片代理

Enhance image handling and streamline frontend parsing

Improve Gemini image proxying and streamline frontend image display

Embed external images as Base64 and refine extraction

Feat: Extract and display image URLs from bot text

Remove redundant client-side Markdown image link stripping

feat: Display bot images before text content

Feat: Embed Gemini images and improve health checks

Refactor: Move health check and simplify Mermaid parsing

Fix health check endpoint path

Feat: Display Gemini images and add metrics endpoint

feat: Enhance Gemini multimodal response display and optimize API calls

Refactor and enhance Gemini proxy and documentation

Delegate Mermaid rendering to marked.js

Fix: Ensure Mermaid charts render correctly

Feat: Render Mermaid diagrams in chat messages

feat: Delegate Mermaid rendering to Marked.js

Feat: Render Mermaid diagrams in bot messages

feat: Add image upload support for Gemini chat

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