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>

2 files changed, 9 insertions, 4 deletions

diff --git a/packages/docs/app/lib/layout.shared.tsx b/packages/docs/app/lib/layout.shared.tsx
index 6e90ba0..b3595eb 100644
--- a/packages/docs/app/lib/layout.shared.tsx
+++ b/packages/docs/app/lib/layout.shared.tsx
@@ -16,8 +16,13 @@ export function baseOptions(locale: string): BaseLayoutProps {
     links: [
       {
         type: 'main',
-        text: locale === 'zh' ? '文档' : 'Documentation',
-        url: `${localePrefix}/docs`,
+        text: locale === 'zh' ? '使用文档' : 'Manual',
+        url: `${localePrefix}/docs/manual`,
+      },
+      {
+        type: 'main',
+        text: locale === 'zh' ? '开发文档' : 'Development',
+        url: `${localePrefix}/docs/development`,
       },
     ],
   };
diff --git a/packages/docs/app/lib/source.ts b/packages/docs/app/lib/source.ts
index bce9bf9..4d6cc3a 100644
--- a/packages/docs/app/lib/source.ts
+++ b/packages/docs/app/lib/source.ts
@@ -7,6 +7,6 @@ export const source = loader({
   baseUrl: '/docs',
   i18n,
   // hideLocale: 'default-locale' 会自动生成正确的 URL:
-  // - 默认语言 (zh): /docs/getting-started
-  // - 其他语言 (en): /en/docs/getting-started
+  // - 默认语言 (zh): /docs/manual/getting-started
+  // - 其他语言 (en): /en/docs/manual/getting-started
 });