feat: update tag and timeline share panel copy for clarity and conciseness

style: enhance global CSS for better responsiveness of terminal chips and navigation pills

test: remove inline subscription test and add maintenance mode access code test

feat: implement media library picker dialog for selecting images from the media library

feat: add media URL controls for uploading and managing media assets

feat: add migration for music_enabled and maintenance_mode settings in site settings

feat: implement maintenance mode functionality with access control

feat: create maintenance page with access code input and error handling

chore: add TypeScript declaration for QR code module

backend/assets/seeds/site_settings.yaml

@@ -2,10 +2,10 @@
   site_name: "InitCool"
   site_short_name: "Termi"
   site_url: "https://init.cool"
-  site_title: "InitCool · 中文长文与 AI 搜索实验站"
-  site_description: "一个偏终端审美的中文内容站，用来测试文章检索、AI 问答、段落评论与后台工作流。"
-  hero_title: "欢迎来到我的中文内容实验站"
-  hero_subtitle: "这里有长文章、评测、友链，以及逐步打磨中的 AI 搜索体验"
+  site_title: "InitCool · 技术笔记与内容档案"
+  site_description: "围绕开发实践、产品观察与长期积累整理的中文内容站。"
+  hero_title: "欢迎来到 InitCool"
+  hero_subtitle: "记录开发实践、产品观察与长期积累，分享清晰、耐读、可回看的内容。"
   owner_name: "InitCool"
   owner_title: "Rust / Go / Python Developer · Builder @ init.cool"
   owner_bio: "InitCool，GitHub 用户名 limitcool。坚持不要重复造轮子，当前在维护 starter，平时主要写 Rust、Go、Python 相关项目，也在持续学习 AI 与 Web3。"
@@ -43,6 +43,9 @@
       cover_image_url: "https://images.unsplash.com/photo-1493225457124-a3eb161ffa5f?auto=format&fit=crop&w=600&q=80"
       accent_color: "#375a7f"
       description: "节奏更明显一点，适合切换阅读状态。"
+  music_enabled: true
+  maintenance_mode_enabled: false
+  maintenance_access_code: null
   ai_enabled: false
   paragraph_comments_enabled: true
   comment_verification_mode: "captcha"