feat: Pool Creation Blockchain Interaction

[zintarh]

This PR implements the pool creation blockchain interaction feature as described in issue #59.

Changes

• Added @stellar/stellar-sdk dependency for Soroban contract interaction
• Created frontend/src/utils/soroban.ts utility for building and submitting pool creation transactions
• Created frontend/src/app/create-pool/page.tsx with a comprehensive form for pool creation
• Updated frontend/src/app/discovery/page.tsx to link the "Create a Pool" button to the new page

Features

• ✅ Transaction signing flow via wallet kit
• ✅ Success state with link to Stellar Expert explorer
• ✅ Error handling for rejected transactions
• ✅ Form validation and user feedback
• ✅ Integration with existing wallet connection utilities

closes #59

[Akshola00]

@zintarh thank you for your contribution
pls fix lint issues and resolve conflicts