docs: add weapp-vite DevTools to ecosystem showcase

[daguanren21]

Summary

Add weapp-vite DevTools to Built with Devframe.

• Add the project description, author, and dashboard repository link.
• Add a 1920×1080 WebP screenshot of the build analysis overview from the Varo/RealWorld integration.
• Follow the existing showcase format, as used in docs: add an ecosystem page for devtools, hosts, services and kits built on Devframe #427. No component or runtime changes.

Preview

Verification

• pnpm lint
• pnpm knip
• pnpm typecheck
• pnpm build
• pnpm test --maxWorkers=1 --no-file-parallelism — 147 files passed; 1,639 tests passed, 13 skipped.
• Checked the card layout and links on desktop and mobile, in light and dark themes. Checked the final overview cover on the ecosystem page.

Prepared with AI assistance. The contributor reviewed and approved the final card and screenshot.

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