fix(uom): remove strict pattern validation from uom_group_code field

- Remove regex pattern constraint from uom_group_code field in UomGroupBase schema
- Allow flexible code format while maintaining auto-generation capability
- Simplify validation to support various code formats without strict pattern matching
- Improves flexibility for UOM group code generation and management

app/uom/schemas/schema.py

@@ -58,7 +58,7 @@ class UomUnitBase(BaseModel):
 class UomGroupBase(BaseModel):
     """Base schema for UOM Group"""
     uom_group_id: Optional[str] = Field(None, min_length=10, max_length=50, description="Unique group identifier (UUID, auto-generated if not provided)")
-    uom_group_code: Optional[str] = Field(None, pattern=r"^UOM-[A-Z]{3}-\d{6}$", description="Auto-generated code format: UOM-XXX-NNNNNN (e.g., UOM-VOL-000001)")
+    uom_group_code: Optional[str] = Field(None, description="Auto-generated code format: UOM-XXX-NNNNNN (e.g., UOM-VOL-000001)")
     name: str = Field(..., min_length=2, max_length=100, description="Display name")
     description: Optional[str] = Field(None, max_length=500, description="Optional description")