Payout flows in backend - fix Tremendous forex cards (#5001)

* wip: payouts flow api

* working

* Finish up flow migration

* vibe-coded frontend changes

* fix typos and vue

* fix: types

---------

Co-authored-by: Calum H. (IMB11) <contact@cal.engineer>

packages/modrinth-util/src/decimal.rs

@@ -48,6 +48,10 @@ impl<const DP: u32> DecimalDp<DP> {
         }
     }
 
+    pub const fn new_unchecked(v: Decimal) -> Self {
+        Self(v)
+    }
+
     pub fn get(self) -> Decimal {
         self.0
     }