feat: add Vue SFC project support

[ubugeeei]

Summary

• Add Vue 3 and Vite Vue plugin support for Studio and render builds.
• Add a Vue SFC bridge (src/lib/vue) with Vue-facing Project, TimeLine, Clip, FillFrame, Video, frame composables, and duration reporting.
• Move the editable sample project to project/project.vue, keeping project/project.tsx as the FrameScript compatibility wrapper.
• Document Vue SFC authoring in English and Japanese, following the shape of ubugeeei/style-guide.vue.

Validation

• npx tsc -p tsconfig.app.json --noEmit
• npm run build:vite
• npm run build:render
• npm run build:electron
• npm run docs:build
• npm ci --dry-run
• Opened http://127.0.0.1:5173/ with Playwright and confirmed the Vue SFC sample renders with no console errors.