Vault file structure (#278)

* chore(packages): create the file structure for the vault app

Author: jrwbabylonlab

routes/vault/README.md

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+# Vault Application
+
+Vault application for managing BTC staking and ETH interactions under the `/vault` URL path.
+
+## File Structure
+
+```
+routes/vault/src/
+├── VaultLayout.tsx
+├── index.ts
+├── clients/                      # External API and service clients
+│   ├── eth-contract/             # ETH smart contract client for querying data and constructing transactions
+│   │   └── index.ts
+│   ├── morpho-graphql/           # GraphQL client for fetching market, position, and LLTV information from Morpho
+│   │   └── index.ts
+│   ├── vault-api/                # API client for fetching vault list by ETH address from vault-api service
+│   │   └── index.ts
+│   └── vault-provider/           # RPC-based client for vault provider - querying and posting data
+│       └── index.ts
+├── components/                   # React components
+│   └── ui/                       # UI components for vault application
+│       └── index.ts
+├── hooks/                        # Custom React hooks for vault operations
+│   └── index.ts
+├── services/                     # Business logic layer orchestrating clients and transactions
+│   └── index.ts
+├── state/                        # State management for vault application data
+│   └── index.ts
+├── storage/                      # Local storage utilities for persisting intermediate state (e.g., pending transactions, user preferences)
+│   └── index.ts
+├── transactions/                 # Transaction construction logic for BTC and ETH
+│   ├── index.ts
+│   ├── btc/                      # BTC transaction construction for pegIn, claim, and payout operations
+│   │   └── index.ts
+│   └── eth/                      # ETH transaction construction for smart contract interactions
+│       └── index.ts
+├── types/                        # TypeScript type definitions for vault, morpho, and transaction data
+│   └── index.ts
+└── utils/                        # Utility functions for formatting, validation, and helpers
+    └── index.ts
+```

routes/vault/src/clients/eth-contract/index.ts

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+// ETH smart contract client for querying data and constructing transactions

routes/vault/src/clients/morpho-graphql/index.ts

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+// GraphQL client for fetching market, position, and LLTV information from Morpho

routes/vault/src/clients/vault-api/index.ts

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+// API client for fetching vault list by ETH address from vault-api service

routes/vault/src/clients/vault-provider/index.ts

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+// RPC-based client for vault provider - querying and posting data

routes/vault/src/components/ui/index.ts

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+// UI components for vault application

routes/vault/src/hooks/index.ts

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+// Custom React hooks for vault operations

routes/vault/src/services/index.ts

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+// Business logic layer orchestrating clients and transactions

routes/vault/src/state/index.ts

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+// State management for vault application data

routes/vault/src/storage/index.ts

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+// Local storage utilities for persisting intermediate state (e.g., pending transactions, user preferences)