chore: fork dsh-better-sidebar v0.18.0 as dsh-apes-sidebar v1.0.0

- Rename dsh-better-sidebar → dsh-apes-sidebar across 74 files (262 occurrences)
- Bump version 0.18.0 → 1.0.0 (package.json + dsh.plugin.json + SIDEBAR_SERVICE_VERSION)
- Add forkedFrom metadata to package.json (upstream pin: commit 9e1a034)
- Add fork notice banner to README.md (MIT attribution preserved)
- Keep original MIT copyright (c) 2026 dsh-external
- Full gate green: typecheck + build (6 bundles) + test (1241 passed / 9 skipped)

scripts/package-registry.mjs

@@ -6,7 +6,7 @@
  *   pnpm build
  *   node scripts/package-registry.mjs
  *   dsh registry install ./registry
- *   dsh registry enable dsh-external/dsh-better-sidebar
+ *   dsh registry enable dsh-external/dsh-apes-sidebar
  *
  * The registry install copies the whole source directory (`cp -r`), so
  * installing the repo root would drag in `node_modules/` (machine-local
@@ -54,4 +54,4 @@ for (const file of files) {
   cpSync(source, target)
 }
 console.log(`registry/ assembled (${files.length} files)`)
-console.log('next: dsh registry install ./registry && dsh registry enable dsh-external/dsh-better-sidebar')
+console.log('next: dsh registry install ./registry && dsh registry enable dsh-external/dsh-apes-sidebar')