docs: 2G5F4_10G2_V1.01: case photos, nameplate details, serial header position

Add the assembled top, front and bottom of the case next to the PCB photos, and
record what the nameplate says (manufacturer, the model description translated
from the Chinese label, 12 V DC 2 A and the serial number format) so a device
can be identified by its label. The top of the case carries no model name.

Also point out where the three console through-holes sit in the top side photo
and note the PWR and SFP1/SFP2 LEDs on the front panel; the case legend for the
copper LEDs reads 1000M/2500M.

doc/devices/2G5F4_10G2_V1.01.md

@@ -17,11 +17,26 @@ RTLPlayground image fills exactly.
 
 ### Label specifications
 
-- **Manufacturer**: hongyavision
-- **Model**: HYWS-SGT0204S
+Case, top / front / nameplate:
+
+<img src="photos/2G5F4_10G2_V1.01/assembled-top.jpg" width="300" />
+<img src="photos/2G5F4_10G2_V1.01/assembled-front.jpg" width="300" />
+<img src="photos/2G5F4_10G2_V1.01/assembled-bottom.jpg" width="300" />
+
+- **Manufacturer**: hongyavision (Shenzhen Hongyavision Electronic Technology
+  Co., Ltd.)
+- **Model**: HYWS-SGT0204S — the nameplate is printed in Chinese and reads
+  "10/100/1000/2500M fibre switch" and "4x 2.5G copper port + 2x 10G SFP+
+  optical port"
 - **Ports**:
   - 4 × RJ45: 10/100/1000/2500 Mbps
   - 2 × SFP+: 1G / 2.5G / 10G
+- **Power**: 12 V DC, 2 A
+- **Serial number**: `S/N-YYYYMMDDNNNN`, e.g. `S/N-202312010028`
+
+The top of the case only carries generic printing ("2.5G+10G High Speed Fiber
+Transceiver / 4-Port 2.5G Ethernet Switch+10G Fiber"), so the nameplate on the
+bottom is what identifies the device.
 
 ### What works
 
@@ -81,8 +96,10 @@ SDS0.
 
 ### Serial console
 
-The board has three through-holes used as the serial console. **The silkscreen
-labels are wrong**: they are shifted relative to the actual signals.
+The board has three through-holes used as the serial console, next to the
+heatsink in the middle of the board and visible in the top side photo above (the
+silkscreen labels are printed rotated by 90°). **The silkscreen labels are
+wrong**: they are shifted relative to the actual signals.
 
 | Silkscreen label | Actual signal |
 |------------------|---------------|
@@ -106,13 +123,15 @@ Wiring (following the measured signals, not the labels):
 
 ### LED configuration
 
-Case silkscreen:
+Case silkscreen, below the RJ45 ports:
 
 ```
-White : 2.5G
-Blue  : 1000M/2.5G L/A
+White : 2.5G    Blue : 1000M/2500M L/A
 ```
 
+The front panel also carries a `PWR` LED and one LED per SFP cage (`SFP1`,
+`SFP2`) on the right hand side.
+
 | Port       | LED          | Linked, idle | With traffic |
 |------------|--------------|--------------|--------------|
 | Copper     | white        | 2.5G only    | same         |