Create `MsgExecute` with UCAN Token for Verification

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IPFS-stored Vault interactions via ServiceWorker architecture

Key Components:

• VaultAPI: Go backend handling IPFS interactions & request routing
• ServiceWorker: Manages offline-first vault operations & IPFS gateway integration
• Client SDK: Promise-based interface with WebAuthn support

Core Features:

• IPFS-based vault storage with CID addressing
• Offline-first via ServiceWorker
• WebAuthn