Add amount field to job creation — auto-creates bracket when > 1

Amount > 1 with no bracket selected: auto-creates a bracket named
'{customer} – {file} ×{amount}', assigns all jobs to it, and redirects
to the new bracket page. Amount = 1 behaves as before.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/routers/ui.py

@@ -149,6 +149,7 @@ async def create_job(
     customer: str = Form(""),
     filament_id: str = Form(""),
     bracket_id: str = Form(""),
+    amount: int = Form(1),
     notes: str = Form(""),
     stl_file: UploadFile = File(None),
     stl_select: str = Form(""),
@@ -162,20 +163,40 @@ async def create_job(
     elif stl_select:
         filename = stl_select
 
-    job = PrintJob(
-        job_uuid=str(_uuid.uuid4()),
-        name=Path(filename).stem if filename else (customer.strip() or "Unnamed"),
-        file_name=filename,
-        printer_id=int(printer_id) if printer_id else None,
-        filament_id=int(filament_id) if filament_id else None,
-        bracket_id=int(bracket_id) if bracket_id else None,
-        customer=customer.strip() or None,
-        notes=notes.strip() or None,
-    )
-    db.add(job)
-    db.flush()
-    db.add(JobLog(job_id=job.id, message="Job created"))
+    amount = max(1, amount)
+    customer_str = customer.strip() or None
+    job_name = Path(filename).stem if filename else (customer_str or "Unnamed")
+
+    # Resolve bracket — auto-create one when printing multiple copies
+    effective_bracket_id = int(bracket_id) if bracket_id else None
+    if amount > 1 and not effective_bracket_id:
+        bracket_name = f"{job_name} ×{amount}"
+        if customer_str:
+            bracket_name = f"{customer_str} – {bracket_name}"
+        new_bracket = JobBracket(name=bracket_name, customer=customer_str)
+        db.add(new_bracket)
+        db.flush()
+        effective_bracket_id = new_bracket.id
+
+    for _ in range(amount):
+        job = PrintJob(
+            job_uuid=str(_uuid.uuid4()),
+            name=job_name,
+            file_name=filename,
+            printer_id=int(printer_id) if printer_id else None,
+            filament_id=int(filament_id) if filament_id else None,
+            bracket_id=effective_bracket_id,
+            customer=customer_str,
+            notes=notes.strip() or None,
+        )
+        db.add(job)
+        db.flush()
+        db.add(JobLog(job_id=job.id, message="Job created"))
+
     db.commit()
+
+    if effective_bracket_id and amount > 1:
+        return RedirectResponse(url=f"/brackets/{effective_bracket_id}", status_code=HTTP_303_SEE_OTHER)
     return RedirectResponse(url="/jobs", status_code=HTTP_303_SEE_OTHER)