feat: multi-provider tokens

[jess-daniel]

WORK IN PROGRESS

Summary

Implemented multi-account token management with IndexedDB:

1. Created IndexedDB Storage (src/oauth/indexeddb-storage.ts)

   • Stores tokens grouped by provider and email
   • Methods: saveToken, getToken, getTokensByProvider, listAccounts, deleteToken, deleteTokensByProvider, clearAll

2. Updated Token Types (src/oauth/types.ts)

   • Added email and accountId to ProviderTokenData
   • Added AccountInfo interface

3. Created Email Fetcher (src/oauth/email-fetcher.ts)

   • Fetches user email from OAuth providers (GitHub, Gmail, Notion)
   • Called after token exchange

4. Updated OAuth Manager (src/oauth/manager.ts)

   • Replaced localStorage with IndexedDB (when no callbacks)
   • Fetches email after token exchange
   • Updated methods to support email parameter
   • Added listAccounts() and disconnectAccount() methods
   • Removed skipIndexedDB flag (uses same pattern as before: callbacks if provided, otherwise IndexedDB)

5. Updated Client API (src/client.ts)

   • Added listAccounts(provider) method
   • Added disconnectAccount(provider, email) method
   • Updated isAuthorized(), getProviderToken(), setProviderToken(), getAuthorizationStatus() to support email parameter
   • Updated disconnectProvider() to disconnect all accounts

6. Updated Config Types (src/config/types.ts)

   • Updated callback signatures to support email parameter

7. Updated Server Adapter (src/adapters/base-handler.ts)

   • Updated setProviderToken call to match new signature

8. Exported Types (src/index.ts)

   • Added AccountInfo to exports

All linter errors are fixed. The implementation follows the same pattern as before: use database callbacks when provided, otherwise use IndexedDB (replacing localStorage).`

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