Consolidate the duplicated score clamp and parse helpers

[sshdopey]

Context

RegistryTable and OracleForms each define their own clamp and money/score parsing helpers with the same intent.

Scope

• Extract the shared clamp and parse helpers into one util and reuse them.

Acceptance criteria

• The admin screens share one clamp and parse implementation.

Pointers

src/screens/admin/RegistryTable.tsx, src/screens/admin/OracleForms.tsx.

[fadesany]

@fadesany has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainer, i would like to work on this issue

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