fix: enforce equal aspect ratio to prevent horizontal map compression

revert: coordinate format back to decimal degrees

feat: use DMS coordinate format (Degrees, Minutes, Seconds)

fix: handle coordinate swapping and fix 'Shell empty' geometry error

feat: allow generating poster with no text by leaving fields blank

feat: improve custom coordinate text layout (two-line title/subtitle)

big enhancement

province added

fix

full China city updated

feat: initial clean project structure with Git LFS