general fixes and ordering display overhaul

local_backend/schemas/printer.py

@@ -2,11 +2,19 @@ from pydantic import BaseModel
 from typing import Optional
 
 
+PROTOCOLS = ["escpos_tcp"]  # extend later as needed
+
+
 class PrinterBase(BaseModel):
     name: str
     ip_address: str
     port: int = 9100
     is_active: bool = True
+    protocol: str = "escpos_tcp"
+
+
+class PrinterCreate(PrinterBase):
+    pass
 
 
 class PrinterUpdate(BaseModel):
@@ -14,6 +22,7 @@ class PrinterUpdate(BaseModel):
     ip_address: Optional[str] = None
     port: Optional[int] = None
     is_active: Optional[bool] = None
+    protocol: Optional[str] = None
 
 
 class PrinterOut(PrinterBase):