feat: add Web3 wallet linking to CryptID accounts
- Add WalletLinkPanel component for connecting and linking wallets
- Add useWallet hooks (useWalletConnection, useWalletLink, useLinkedWallets)
- Add wallet API endpoints in worker (link, list, update, unlink, verify)
- Add proper signature verification with @noble/hashes and @noble/secp256k1
- Add D1 migration for linked_wallets table
- Integrate wallet section into Settings > Integrations tab
- Support for MetaMask, WalletConnect, Coinbase Wallet
- Multi-chain support: Ethereum, Optimism, Arbitrum, Base, Polygon
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>