feat: add Solana file upload example

[0xmaayan]

A simple Solana dApp demonstrating file uploads to Shelby Protocol.

What's included

• Simple file upload to Shelby using Solana wallet
• Uses the new @shelby-protocol/solana-kit/react API
• Same stack as token-gated example (create-solana-dapp) but without Anchor

Packages used

• @solana/react-hooks - wallet connection
• @shelby-protocol/solana-kit/react - storage account derivation
• @shelby-protocol/react - blob uploads

Files

apps/solana/file-upload/
├── app/
│   ├── components/
│   │   ├── file-upload.tsx
│   │   ├── header.tsx
│   │   ├── providers.tsx
│   │   └── wallet-button.tsx
│   ├── lib/
│   │   ├── config.ts
│   │   └── shelbyClient.ts
│   ├── globals.css
│   ├── layout.tsx
│   └── page.tsx
├── package.json
└── README.md

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Note

Low Risk
Adds a new standalone Next.js example app and updates the lockfile; no existing production logic is modified beyond dependency resolution.

Overview
Adds a new apps/solana/file-upload Next.js example that lets users connect a Solana wallet (via @solana/react-hooks), derives a Shelby storage account with the updated @shelby-protocol/solana-kit/react API, and uploads a selected file as a blob (with basic status/error UI and an Explorer link).

Includes app scaffolding/config (Providers with React Query + Solana client autodiscovery, Tailwind styling, Next/TS/ESLint configs), plus .env.example/README.md and pnpm-lock.yaml updates to pull in the new app’s dependencies.

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