docs: add API explorer template component and fix rendering

Phase 3 part 1: Add interactive API explorer
- Create templates/api_explorer.templ with mock and real modes
- Add EndpointInfo and APIExplorerData types to templates/types.go
- Fix markdown rendering with UnsafeHTML.ToComponent()
- Add templ import for Component support
- API explorer supports:
  - Mock data mode for non-authenticated users
  - Real execution mode for logged-in users
  - Request/response display
  - cURL generation
  - Copy to clipboard

templates/docs.templ

@@ -238,7 +238,7 @@ templ DocsLayout(nav Navigation, doc Document, user User) {
 				
 				<!-- Content -->
 				<div>
-					@rawHTML(doc.Content)
+					@UnsafeHTML(doc.Content).ToComponent()
 				</div>
 			</div>