fix(radar): link build-routes docs to the route namespace page

The docs site only builds pages for namespace keys, so the category
links written into radar-rules.json/js pointed at missing pages.
0a3a66a1c fixed the API rules; do the same for the build output.

Refs #17785

scripts/workflow/build-routes.ts

@@ -40,25 +40,10 @@ const allRoutePaths = new Set<string>();
 // Use all namespaces for both regular and Worker builds.
 for (const namespace in namespaces) {
     const namespaceData = namespaces[namespace];
-    let defaultCategory = namespaceData.categories?.[0];
-    if (!defaultCategory) {
-        for (const path in namespaceData.routes) {
-            if (!namespaceData.routes[path].categories) {
-                continue;
-            }
-
-            defaultCategory = namespaceData.routes[path].categories[0];
-            break;
-        }
-    }
-    if (!defaultCategory) {
-        defaultCategory = 'other';
-    }
     for (const path in namespaceData.routes) {
         const realPath = `/${namespace}${path}`;
         allRoutePaths.add(realPath);
         const data = namespaceData.routes[path];
-        const categories = data.categories || namespaceData.categories || [defaultCategory];
         // maintainers
         if (data.maintainers) {
             maintainers[realPath] = data.maintainers;
@@ -82,7 +67,7 @@ for (const namespace in namespaces) {
                 }
                 radar[domain][subdomain].push({
                     title: radarItem.title || data.name,
-                    docs: `https://docs.rsshub.app/routes/${categories[0]}`,
+                    docs: `https://docs.rsshub.app/routes/${namespace}`,
                     source: radarItem.source.map((source) => {
                         const sourceURL = new URL('https://' + source);
                         return sourceURL.pathname + sourceURL.search + sourceURL.hash;