printedparts: gage-lab asset tag + print-files redesign

The gage lab assigns real WJRP asset numbers: internal itemcode stays
auto-minted, a new optional unique gagelabtag carries the lab's number,
searchable and kiosk-resolved (scans and bare digits against either
identifier). Print files render as stacked revision cards instead of a
scrolling table.

plugins/printedparts/models/printeditem.py

@@ -28,6 +28,8 @@ class PrintedItem(BaseModel):
     printeditemid = db.Column(db.Integer, primary_key=True)
     itemcode = db.Column(db.String(20), unique=True, index=True,
                          comment='Generated bin-label code, e.g. 3DP-0042')
+    gagelabtag = db.Column(db.String(50), unique=True, index=True,
+                           comment='Gage-lab assigned asset tag, e.g. WJRP0117')
     itemname = db.Column(db.String(120), nullable=False)
     itemdescription = db.Column(db.String(500))
     imageurl = db.Column(db.String(255))
@@ -48,6 +50,7 @@ class PrintedItem(BaseModel):
         return {
             'printeditemid': self.printeditemid,
             'itemcode': self.itemcode,
+            'gagelabtag': self.gagelabtag,
             'itemname': self.itemname,
             'itemdescription': self.itemdescription,
             'imageurl': self.imageurl,