Restructure docs into manual/development and add implementation docs (#94)

## Summary by Sourcery

Restructure documentation into separate manual and development sections,
introduce detailed internal implementation docs for auth/Java/mod
loaders, and update site navigation, landing page links, and MDX tooling
(Mermaid, card styling) to match the new structure and tech stack.

Enhancements:
- Enable Mermaid rendering support in the docs app and add a reusable
Mermaid React component.
- Refine Docs page rendering by customizing Card styling and removing
redundant in-page titles/descriptions rendered by the layout.
- Align docs source configuration and routing comments with the new
manual-based default paths.

Documentation:
- Split user-facing docs under a new manual section and move contributor
content into a dedicated development section for both English and
Chinese.
- Add comprehensive internal implementation documentation covering
authentication, Java management, mod loader/version merging, event bus,
and architecture patterns in both English and Chinese.
- Update existing feature docs (mod loaders, Java, authentication) and
getting-started/troubleshooting pages to be more conceptual, pointing to
implementation docs for technical details.
- Refresh architecture docs to reflect the React/Zustand frontend stack
and add Mermaid-based architecture diagrams.
- Adjust navigation labels, home-page CTAs, and doc links to target the
new manual/development structure and routes.

---------

Co-authored-by: 简律纯 <i@jyunko.cn>

1 files changed, 0 insertions, 176 deletions

diff --git a/packages/docs/content/en/features/index.mdx b/packages/docs/content/en/features/index.mdx
deleted file mode 100644
index 3a463d0..0000000
--- a/packages/docs/content/en/features/index.mdx
+++ /dev/null
@@ -1,176 +0,0 @@
----
-title: Features Overview
-description: Comprehensive guide to all DropOut features
----
-
-# Features Overview
-
-DropOut is packed with features designed for both casual players and power users. This guide covers all major capabilities.
-
-## Core Features
-
-<Cards>
-  <Card 
-    title="Authentication" 
-    href="authentication"
-    description="Microsoft OAuth and offline authentication"
-  />
-  <Card 
-    title="Java Management" 
-    href="java"
-    description="Auto-detection and installation of Java runtimes"
-  />
-  <Card 
-    title="Mod Loaders" 
-    href="mod-loaders"
-    description="Fabric and Forge support with easy installation"
-  />
-  <Card 
-    title="Instances" 
-    href="instances"
-    description="Isolated game environments with independent configs"
-  />
-  <Card 
-    title="Downloads" 
-    href="downloads"
-    description="Fast concurrent downloads with resume support"
-  />
-  <Card 
-    title="AI Assistant" 
-    href="assistant"
-    description="Built-in AI helper for troubleshooting and guidance"
-  />
-</Cards>
-
-## Quick Feature Matrix
-
-| Feature | Status | Description |
-|---------|--------|-------------|
-| Microsoft Authentication | Complete | OAuth 2.0 with device code flow |
-| Offline Authentication | Complete | Local accounts for offline play |
-| Token Auto-refresh | Complete | Automatic refresh of expired tokens |
-| Java Auto-detection | Complete | Scans system for Java installations |
-| Java Download | Complete | Download Adoptium JDK/JRE versions |
-| Fabric Support | Complete | Install and launch Fabric loader |
-| Forge Support | Complete | Install and launch Forge loader |
-| Instance System | Complete | Isolated game environments |
-| GitHub Integration | Complete | View releases and changelogs |
-| Concurrent Downloads | Complete | Multi-threaded asset downloads |
-| Resume Downloads | Complete | Resume interrupted downloads |
-| AI Assistant | Complete | Built-in troubleshooting helper |
-| Config Editor | Complete | JSON/TOML configuration editor |
-| Custom Resolution | Complete | Set game window dimensions |
-| Memory Allocation | Complete | Customize JVM memory settings |
-| Multi-account | In Progress | Switch between multiple accounts |
-| Mods Manager | Planned | Enable/disable mods in launcher |
-| Launcher Auto-update | Planned | Self-updating mechanism |
-| Custom Game Directory | Planned | Choose game files location |
-| Import Profiles | Planned | Import from MultiMC/Prism |
-
-## Performance Features
-
-### Concurrent Downloads
-- Configurable thread count (default: 10)
-- Parallel asset and library downloads
-- Progress tracking per file
-- ETA calculation
-
-### Resume Support
-- Interrupted downloads auto-resume
-- `.part` files track progress
-- Multi-segment downloads for large files
-- Metadata files for state tracking
-
-### Caching
-- Java catalog cached for 24 hours
-- Version manifests cached locally
-- Asset index caching
-- Library deduplication
-
-## User Interface Features
-
-### Modern Design
-- Dark mode enforced for eye comfort
-- Particle background effects
-- Clean, distraction-free layout
-- Responsive design
-
-### Real-time Feedback
-- Live download progress
-- Game console output
-- Log streaming
-- Toast notifications
-
-### Settings Management
-- Memory allocation slider
-- Resolution customization
-- Java path selection
-- Thread count configuration
-- Custom JVM arguments
-
-## Advanced Features
-
-### Version Inheritance
-Modded versions (Fabric/Forge) automatically inherit from parent vanilla versions:
-- Libraries merged from parent + mod loader
-- Arguments combined and deduplicated
-- Assets inherited from vanilla version
-
-### Native Library Extraction
-- Platform-specific native extraction
-- Automatic cleanup
-- Proper library path configuration
-
-### Rules Engine
-- OS-specific library filtering
-- Feature flag support
-- Architecture detection
-
-### Download Queue Persistence
-- Save incomplete downloads
-- Resume after launcher restart
-- Queue priority management
-
-## Developer Features
-
-### Config Editor
-Built-in JSON/TOML editor with:
-- Syntax highlighting
-- Validation
-- Quick access to all configs
-
-### Log Access
-- Real-time game logs
-- Launcher debug logs
-- Copy/export functionality
-
-### AI Assistant
-- Troubleshooting guidance
-- Error analysis
-- Configuration help
-- Documentation search
-
-## Coming Soon
-
-### Multi-account Management
-- Switch between accounts easily
-- Account profiles
-- Quick switching
-
-### Mods Manager
-- Browse and install mods
-- Enable/disable mods
-- Mod compatibility checking
-- Version management
-
-### Profile Import
-- Import from MultiMC
-- Import from Prism Launcher
-- Import from other launchers
-- Preserve settings and saves
-
-### Launcher Auto-update
-- Background update checks
-- One-click updates
-- Version history
-- Rollback support