Add spool_id support to RFID filament protocol

Add `spool_id` field to OpenSpool protocol for integration with spool
management systems. The `spool_id` is stored in `print_task_config` and
can be set via RFID tags or `SET_PRINT_FILAMENT_CONFIG` command.

Author: paxx12

docs/rfid_support.md

@@ -61,7 +61,8 @@ Example payload:
   "min_temp": 190,
   "max_temp": 220,
   "bed_min_temp": 50,
-  "bed_max_temp": 60
+  "bed_max_temp": 60,
+  "spool_id": 1
 }
 ```
 
@@ -101,6 +102,7 @@ Using the non-standard OpenSpool `subtype` field it is possible to specify a mat
 - `additional_color_hexes` - Additional colors for multicolor spools (up to 4)
 - `weight` - Spool weight in grams
 - `diameter` - Filament diameter in mm (e.g., 1.75)
+- `spool_id` - Spoolman spool ID for integration with spool management systems
 
 ### Snapmaker Orca Naming Convention
 

overlays/firmware-extended/13-patch-rfid/root/home/lava/klipper/klippy/extras/filament_protocol_ndef.py

@@ -224,6 +224,11 @@ def openspool_parse_payload(payload, card_uid=[]):
         info['OFFICIAL'] = True
         info['CARD_UID'] = card_uid
 
+        try:
+            info['SPOOL_ID'] = int(data.get('spool_id', 0))
+        except (ValueError, TypeError):
+            info['SPOOL_ID'] = 0
+
         return filament_protocol.FILAMENT_PROTO_OK, info
 
     except json.JSONDecodeError as e:

overlays/firmware-extended/13-patch-rfid/test/openspool-pla-basic.json

@@ -7,5 +7,6 @@
   "min_temp": 190,
   "max_temp": 220,
   "bed_min_temp": 50,
-  "bed_max_temp": 60
+  "bed_max_temp": 60,
+  "spool_id": 1
 }