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/patches/jpegio/apply-patch.sh

@@ -0,0 +1,105 @@
+#!/bin/bash
+#
+# Apply ARM64 patch to jpegio
+# This script tries multiple strategies to remove the x86-specific -m64 flag
+#
+# Usage: ./apply-patch.sh /path/to/jpegio
+#
+
+set -e
+
+JPEGIO_DIR="${1:-.}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PATCH_FILE="$SCRIPT_DIR/arm64.patch"
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+cd "$JPEGIO_DIR"
+
+echo "Applying ARM64 patch to jpegio..."
+
+# Strategy 1: Try the standard patch file
+if [ -f "$PATCH_FILE" ]; then
+    echo "  Trying patch file..."
+    if patch -p1 --dry-run < "$PATCH_FILE" >/dev/null 2>&1; then
+        patch -p1 < "$PATCH_FILE"
+        echo -e "  ${GREEN}✓ Patch applied successfully${NC}"
+        exit 0
+    else
+        echo -e "  ${YELLOW}Patch file didn't apply cleanly, trying fallback...${NC}"
+    fi
+fi
+
+# Strategy 2: Sed replacement (handles any number of occurrences)
+if grep -q "cargs.append('-m64')" setup.py 2>/dev/null; then
+    echo "  Using sed fallback..."
+    sed -i "s/cargs.append('-m64')/pass  # ARM64: removed x86-specific -m64 flag/g" setup.py
+
+    # Verify the fix
+    if grep -q "cargs.append('-m64')" setup.py; then
+        echo -e "  ${RED}✗ Sed replacement failed${NC}"
+        exit 1
+    fi
+
+    echo -e "  ${GREEN}✓ Sed fallback successful${NC}"
+    exit 0
+fi
+
+# Strategy 3: Check if already patched
+if grep -q "ARM64: removed" setup.py 2>/dev/null; then
+    echo -e "  ${GREEN}✓ Already patched${NC}"
+    exit 0
+fi
+
+# Strategy 4: Python-based patching (most flexible)
+echo "  Using Python fallback..."
+python3 << 'PYTHON_PATCH'
+import re
+import sys
+
+with open('setup.py', 'r') as f:
+    content = f.read()
+
+original = content
+
+# Pattern 1: Direct replacement
+content = re.sub(
+    r"cargs\.append\(['\"]+-m64['\"]+\)",
+    "pass  # ARM64: removed x86-specific -m64 flag",
+    content
+)
+
+# Pattern 2: Handle variations with different quotes or spacing
+content = re.sub(
+    r"cargs\.append\s*\(\s*['\"]+-m64['\"]+\s*\)",
+    "pass  # ARM64: removed x86-specific -m64 flag",
+    content
+)
+
+if content == original:
+    # Check if already patched or pattern not found
+    if "ARM64: removed" in content:
+        print("Already patched")
+        sys.exit(0)
+    else:
+        print("Warning: -m64 pattern not found in setup.py")
+        print("This may indicate jpegio's structure has changed significantly")
+        sys.exit(0)  # Don't fail - maybe they removed it upstream
+
+with open('setup.py', 'w') as f:
+    f.write(content)
+
+print("Python patch applied")
+PYTHON_PATCH
+
+if [ $? -eq 0 ]; then
+    echo -e "  ${GREEN}✓ Python fallback successful${NC}"
+    exit 0
+fi
+
+echo -e "${RED}✗ All patching strategies failed${NC}"
+echo "Please check jpegio's setup.py manually"
+exit 1

rpi/patches/jpegio/arm64.patch

@@ -0,0 +1,17 @@
+--- a/setup.py
++++ b/setup.py
+@@ -69,12 +69,12 @@
+     largs.append('-mmacosx-version-min=10.9')
+
+     if arch == 'x64':
+-        cargs.append('-m64')
++        pass  # ARM64: removed x86-specific -m64 flag
+ elif sys.platform == 'linux':
+     cargs.extend(['-w', '-fPIC'])
+
+     if arch == 'x64':
+-        cargs.append('-m64')
++        pass  # ARM64: removed x86-specific -m64 flag
+     dname_libjpeg = 'libjpeg'
+
+ # end of if-else