Step 3 of the planned vue->react migration. The five api-docs files
(ApiDocsPage, CodeBlock, EndpointRow, EndpointSection, plus the
data-only endpoints.js) all move to react+ts.
Also introduces components/AppSidebar.tsx — api-docs is the first
authenticated page to need it. AppSidebar.vue stays in place for the
six remaining vue entries (settings, inbounds, clients, xray, nodes,
index); each gets switched to AppSidebar.tsx as its entry migrates.
After the last entry flips, AppSidebar.vue is deleted.
Notable transformations:
* The scroll observer that highlights the active TOC link is a
useEffect keyed on sections — re-registers whenever the visible
set changes (search filter narrows it). Same behaviour as the vue
watchEffect.
* v-html="safeInlineHtml(...)" becomes
dangerouslySetInnerHTML={{ __html: safeInlineHtml(...) }}. The
helper still escapes everything except <code> tags.
* JSON syntax highlighter in CodeBlock is unchanged — pure regex on
the escaped string, then rendered via dangerouslySetInnerHTML.
* endpoints.js stays as JS (allowJs in tsconfig); only the consumer
signatures (Endpoint, Section) are typed at the React boundary.
* AppSidebar reuses pauseAnimationsUntilLeave + useTheme from
step 1. Drawer + Sider keyed off the same localStorage flag
(isSidebarCollapsed) and DOM theme attributes the vue version
uses, so the two stay in sync during coexistence.
