installer-rp: ship installer/styles.css so packaged UI renders

The rp installer's `index.html` references `../installer/styles.css`,
which works in dev because both source directories sit side by side.
The packaged exe's `files` list only included `installer-rp/**`, so
inside the asar the stylesheet path resolved to nothing and the UI
rendered completely unstyled (per user screenshot).

Add the single shared file `installer/styles.css` to the rp build's
file list. The cross-directory `<link>` reference now resolves inside
the asar, and we avoid duplicating the stylesheet.

Bump to 0.1.1 — small patch-level fix.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

electron-builder-rp.yml

@@ -11,6 +11,10 @@ files:
   - dist/installer-rp/**
   - dist/shared/**
   - installer-rp/**
+  # rp 의 index.html 은 메인 설치기와 동일한 styles.css 를 공유함
+  # (`<link href="../installer/styles.css">`). asar 안에 해당 파일이 없으면
+  # UI 가 무스타일로 렌더링되므로 그 한 파일만 명시적으로 포함.
+  - installer/styles.css
   - build/icon.*
   - package.json
   # sharp 는 플랫폼별 prebuilt 가 분리 패키지로 배포됨. Windows 빌드에서는