refactor(wallet): make wallet provider extensible end-to-end

[0xkkkn]

Summary

Prepares platform-modules to onboard additional wallet providers (specifically JustaLab / jaw.id) without requiring any refactor of existing flows. After this lands, adding a new provider is a purely additive PR — one new class + one switch case + env keys.

Also fixes a pre-existing bug where walletProvider on user creation was hardcoded to 'walletconnect' regardless of which wallet the user actually authenticated with.

Changes

Frontend (packages/app)

• stores/wallet-store.ts — extract createProvider(type) factory; reconnect() reads persisted provider type from localStorage instead of hardcoding zerodev. register(type, username) now takes provider type.
• hooks/use-auth.ts — login(providerType) and register(username, providerType) flow the type through the entire chain (default 'zerodev', backwards-compatible).
• services/AuthService.ts — verifyWallet() accepts an optional walletProvider, sent as wallet_provider in the POST body.

Backend (packages/backend)

• application/dto/auth/verify-wallet.dto.ts — accepts optional wallet_provider: z.string().min(1).max(64).
• application/use-case/auth/verify-wallet.use-case.ts — persists dto.wallet_provider ?? 'unknown' instead of the previously hardcoded 'walletconnect'.
• domain/auth/model/user.ts — opens WalletProvider type from 'zerodev' | 'walletconnect' to string (open extension point — domain shouldn't gatekeep provider names).
• infrastructure/repository/postgres/schema.ts — drops the walletProviderEnum and uses a text column. New providers no longer require a Postgres enum migration.

Test plan

• pnpm typecheck passes in packages/app
• pnpm typecheck passes in packages/backend
• pnpm test — 13/13 in packages/app
• pnpm test — 262/262 in packages/backend
• Manual smoke: ZeroDev login still works in dev (pnpm dev:app)
• Manual smoke: a fresh user record now stores the actual provider used (was always 'walletconnect')

What this unlocks for partners (e.g. JustaLab)

A partner adding a new wallet provider only needs to:

1. Implement IWalletProvider in packages/app/src/providers/<name>/<name>.provider.ts.
2. Add one case to the createProvider() switch in wallet-store.ts and extend WalletProviderType.
3. Add VITE_<NAME>_* env keys and the SDK to package.json.
4. (Optional) Wallet-picker UI on login/register routes.

No edits to use-auth.ts, no edits to backend SIWE verification (already EIP-1271-aware via viem), no schema migrations.

[github-actions]

🎉 This PR is included in version 0.3.0 🎉

The release is available on GitHub release

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