enhancement: enforce global ESLint and Prettier configurations

[devmocrea]

Description

Define uniform code formatting rules at the root level of the monorepo to ensure syntax consistency.

Technical Specification

• Add a shared .prettierrc file to the repository root.
• Extend ESLint profiles inside the workspace packages to inherit from the shared root layout.

Acceptance Criteria

• Formatter rules are applied consistently across web, contracts, and sdk.