Fix shell script formatting in generate-logo.sh

Change all function definitions to K&R style (opening brace on same
line) to comply with shfmt formatting requirements in CI.

The CI uses 'shfmt -i 4 -bn -ci -sr' which defaults to K&R style
(no -fn flag), requiring function opening braces on the same line as
the function name.

Fixed functions:
- extract_ascii_art()
- detect_imagemagick()
- detect_font()
- generate_png()
- usage()
- main()

Author: jserv

scripts/generate-logo.sh

@@ -31,8 +31,7 @@ CANVAS_WIDTH=1600
 MIN_LINES=10
 
 # Extract ASCII art from README.md comment block
-extract_ascii_art()
-{
+extract_ascii_art() {
     if [[ ! -f "$README" ]]; then
         echo "Error: README.md not found at $README" >&2
         return 1
@@ -63,8 +62,7 @@ extract_ascii_art()
 }
 
 # Detect available ImageMagick command
-detect_imagemagick()
-{
+detect_imagemagick() {
     if command -v magick &> /dev/null; then
         echo "magick"
     elif command -v convert &> /dev/null; then
@@ -75,8 +73,7 @@ detect_imagemagick()
 }
 
 # Detect available font from preference list
-detect_font()
-{
+detect_font() {
     local available_fonts
     available_fonts=$(magick -list font 2> /dev/null | grep -i "Font:" | awk '{print $2}' || echo "")
 
@@ -92,8 +89,7 @@ detect_font()
 }
 
 # Generate PNG using ImageMagick
-generate_png()
-{
+generate_png() {
     local ascii_art="$1"
 
     # Detect ImageMagick command
@@ -156,8 +152,7 @@ generate_png()
 }
 
 # Display usage information
-usage()
-{
+usage() {
     cat << EOF
 Usage: $(basename "$0") [OPTIONS]
 
@@ -179,8 +174,7 @@ EOF
 }
 
 # Main execution
-main()
-{
+main() {
     # Parse command line arguments
     while [[ $# -gt 0 ]]; do
         case "$1" in