Auto-acquire Cashu tokens for NIP-46 bunker connections (v0.2.0)

- Add acquireTokenIfNeeded() in BunkerSigner to get CAT before connecting
- Check /cashu/info to detect CAT-enabled relays
- Request token via cashuTokenService with NIP-98 auth using ephemeral key
- Store and reuse tokens across sessions
- Pass token as query parameter on WebSocket connection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/types/index.d.ts

@@ -98,7 +98,7 @@ export interface ISigner {
   nip04Decrypt: (pubkey: string, cipherText: string) => Promise<string>
 }
 
-export type TSignerType = 'nsec' | 'nip-07' | 'browser-nsec' | 'ncryptsec' | 'npub'
+export type TSignerType = 'nsec' | 'nip-07' | 'browser-nsec' | 'ncryptsec' | 'npub' | 'bunker'
 
 export type TAccount = {
   pubkey: string
@@ -106,6 +106,9 @@ export type TAccount = {
   ncryptsec?: string
   nsec?: string
   npub?: string
+  bunkerPubkey?: string
+  bunkerRelays?: string[]
+  bunkerSecret?: string
 }
 
 export type TAccountPointer = Pick<TAccount, 'pubkey' | 'signerType'>