printedparts stage 17: gage-lab asset tag + print-files redesign

The gage lab assigns real WJRP asset numbers, so identity splits: the
internal itemcode stays auto-minted and a new optional unique
gagelabtag (migration 0003) carries the lab's number - settable on
create/edit, searchable, and resolved by the kiosk for scans and bare
keypad digits against the numeric tail of either identifier
(unique-match only). The print-files table becomes stacked revision
cards - filename with rev/current badges, one meta line, delete pinned
right - ending the horizontal scroll in that column.

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,