Add robust jpegio ARM64 patching system

- Create rpi/patches/ directory with multi-strategy patching
- Patch tries: patch file → sed → Python regex → already-patched detection
- Fix jpegio patch to handle multiple -m64 occurrences
- Update docs to use wget instead of curl|bash (stdin conflict with read)
- Update SSH examples to use admin@stegasoo.local

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/BUILD_IMAGE.md

@@ -16,14 +16,17 @@ Use rpi-imager with these settings:
 
 ```bash
 # Wait for Pi to boot (~60 seconds), then:
-ssh pi@stegasoo.local
+ssh admin@stegasoo.local
 # or use IP from router DHCP list
 ```
 
 ## Step 3: Run Setup Script
 
 ```bash
-curl -sSL https://raw.githubusercontent.com/adlee-was-taken/stegasoo/main/rpi/setup.sh | bash
+# Download and run (avoid curl|bash stdin issues)
+wget -O setup.sh https://raw.githubusercontent.com/adlee-was-taken/stegasoo/main/rpi/setup.sh
+chmod +x setup.sh
+./setup.sh
 ```
 
 This takes ~15-20 minutes and installs:
@@ -102,7 +105,7 @@ zstdcat stegasoo-rpi-*.img.zst | sudo dd of=/dev/sdX bs=4M status=progress
 
 ```bash
 # On Pi:
-curl -sSL https://raw.githubusercontent.com/adlee-was-taken/stegasoo/main/rpi/setup.sh | bash
+wget -O setup.sh https://raw.githubusercontent.com/adlee-was-taken/stegasoo/main/rpi/setup.sh && chmod +x setup.sh && ./setup.sh
 sudo systemctl start stegasoo
 curl -k https://localhost:5000
 sudo ~/stegasoo/rpi/sanitize-for-image.sh