Add Public Contract Configuration Getter

[Naomi-Gift]

Some settings are spread across storage and only partially exposed. Frontends need one place to read current contract configuration.

Acceptance criteria:

• Add get_config returning fees, treasury, admin count, pause state if added, limits, and version.
• Keep response stable and documented.
• Tests verify config after initialization and fee updates.

[BigManly4]

Hello maintainer, I would love to resolve this issue within few hours. I am a Full-Stack Dev with contributions to Oss projects. Please assign

[es3298]

@Naomi-Gift PR #308 is open for this GrantFox OSS issue: https://github.com/HubDApp/Dongle-Smartcontract/pull/308\n\nIt adds a stable public get_config snapshot with fee config, treasury, admin count, pause state, version, and public limits, plus tests and docs. Happy to provide the GrantFox/Stellar payout destination after acceptance/merge.