Generate TypeScript client bindings for frontend

[Divineifed1]

Description:
Automate generation of TypeScript client wrappers for all Soroban contracts so the Next.js frontend can interact with them without hand-written RPC calls. Bindings must be committed to the repo and versioned.

Acceptance criteria:

• soroban-cli contract bindings generated into packages/soroban-clients/src/
• Each contract has its own module (betting, rewards, player-nft, vault)
• package.json script: generate:contracts runs stellar contract bindings
• Generated files pass tsc --noEmit without errors
• README documents how to regenerate bindings after contract changes

[mijinummi]

Hello maintainers I'm a full stack developer experience in building scalable systems I can handle this perfectly

[grantfox-oss]

🦊 GrantFox — @mijinummi has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #15)
2. Your PR will be reviewed by the Exquisitech maintainers

Good luck! Track your progress on GrantFox.