Add the SMX1500RM2UNC UPS and expansion battery (#3250)

* Add the `SMX1500RM2UNC` UPS and expansion battery

Similar to an existing UPS model (outlets are the primary differentiation?) and the expansion battery that is common to this entire generation / family of UPS

* test/fix - use the correct gender for incoming power vs outgoing

In my defense, I was very tired at the time.

* bug - update SMX1500RM2UNC with weight/airflow

Addresses: https://github.com/netbox-community/devicetype-library/pull/3250#discussion_r2151459349

* bug - update weight/ariflow for SMX48RMBP2U

Adresses: https://github.com/netbox-community/devicetype-library/pull/3250#discussion_r2151459460

* fix - `s/back/rear/g`

_sigh_

---------

Co-authored-by: Karl Quinsland <contact@kquinsland.com>

device-types/APC/SMX1500RM2UNC.yaml

@@ -0,0 +1,42 @@
+---
+manufacturer: APC
+model: SMX1500RM2UNC
+slug: apc-smx1500rm2unc
+part_number: SMX1500RM2UNC
+comments: |
+  APC Smart-UPS X, Line Interactive, 1500VA, Rack/Tower LCD 120V with Network Card
+u_height: 2
+airflow: front-to-rear
+# 49 cm
+is_full_depth: true
+# 24.82 kg
+weight: 25
+weight_unit: kg
+console-ports:
+  - name: Serial
+    type: rj-45
+  - name: USB
+    type: usb-b
+power-ports:
+  - name: Source
+    type: nema-5-15p
+power-outlets:
+  - name: Group 1 Outlet 1
+    type: nema-5-15r
+  - name: Group 1 Outlet 2
+    type: nema-5-15r
+  - name: Group 1 Outlet 3
+    type: nema-5-15r
+  - name: Group 1 Outlet 4
+    type: nema-5-15r
+  - name: Group 2 Outlet 1
+    type: nema-5-15r
+  - name: Group 2 Outlet 2
+    type: nema-5-15r
+  - name: Group 3 Outlet 1
+    type: nema-5-15r
+  - name: Group 3 Outlet 2
+    type: nema-5-15r
+module-bays:
+  - name: SmartSlot
+    position: SmartSlot

device-types/APC/SMX48RMBP2U.yaml

@@ -0,0 +1,16 @@
+---
+manufacturer: APC
+model: SMX48RMBP2U
+slug: apc-smx48rmbp2u
+part_number: SMX48RMBP2U
+comments: APC Smart-UPS X-Series External Battery Pack Rack/Tower 48V, 864VAh, rackmount, 2U
+u_height: 2
+# 49 cm
+is_full_depth: true
+airflow: passive
+# 28.64 kg
+weight: 29
+weight_unit: kg
+power-ports:
+  - name: UPS Input
+    type: other