fix(13e6): 180° rotate setup screens for ribbon-at-bottom mounting

Matches the server-side V2 physicalRotationDegrees=180° introduced in
pictureFrame-webApp@b355572. The setup screens are firmware-drawn (not
server-rendered) so they need their own compensation:

- scripts/gen_screens_13e6.py rotates the PIL image 180° in save_bin()
  before packing to 4bpp; preview PNGs reflect the rotated layout too.
- All three bg .bins regenerated (ap_bg, ap_bg_retry, setup_bg).
- epd_driver.cpp QR overlay coords updated to the post-rotation
  positions (AP 642,590 → 40,492; Setup 313,750 → 313,276).
- PANEL_FW_VERSION → v1.0.2

To deploy: pio run -e <env> -t upload AND pio run -e <env> -t uploadfs
so the rotated .bins land in LittleFS alongside the new code.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/panels/waveshare13e6/v1/version.h

@@ -3,4 +3,4 @@
 // Panel-specific firmware version for the Waveshare 13.3" Spectra-6 driver.
 // Bump on each driver change worth correlating with server-side reports.
 // Independent of the shared firmware version (HTTP / NVS / sleep / etc.).
-#define PANEL_FW_VERSION "v1.0.1"
+#define PANEL_FW_VERSION "v1.0.2"