feat(core): add currency schemas

app/schemas/currency.py

@@ -0,0 +1,34 @@
+"""Currency schemas — create, update, read, list."""
+
+from __future__ import annotations
+
+from pydantic import BaseModel, Field
+
+
+class CurrencyCreate(BaseModel):
+    code: str = Field(..., min_length=3, max_length=3, description="ISO 4217 code, e.g. EUR")
+    name: str = Field(..., min_length=1, max_length=50)
+    symbol: str = Field(..., min_length=1, max_length=5)
+    is_default: bool = False
+
+
+class CurrencyUpdate(BaseModel):
+    code: str | None = Field(None, min_length=3, max_length=3)
+    name: str | None = Field(None, min_length=1, max_length=50)
+    symbol: str | None = Field(None, min_length=1, max_length=5)
+    is_default: bool | None = None
+
+
+class CurrencyResponse(BaseModel):
+    id: str
+    code: str
+    name: str
+    symbol: str
+    is_default: bool
+    created_at: str | None = None
+    updated_at: str | None = None
+
+
+class CurrencyListResponse(BaseModel):
+    items: list[CurrencyResponse]
+    total: int