Add drawing workspace feature

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

도면작성/geology-extension.ts

@@ -0,0 +1,12 @@
+import type { Rect } from './types';
+/** Optional future log input. No strata, elevations or boring positions are inferred. */
+export type GeologicalLog={id:string;source:string;groundEl:number|null;waterEl:number|null;layers:{name:string;topEl:number|null;bottomEl:number|null}[]};
+export type GeologicalPanel={title:string;area:Rect;logs:readonly GeologicalLog[]};
+export function geologicalPanel(area:Rect,logs:readonly GeologicalLog[]):GeologicalPanel|null {
+ if(!logs.length)return null;
+ for(const log of logs){
+  if(!log.source.trim())throw new Error('지질주상도 원본 출처가 필요합니다.');
+  for(const layer of log.layers)if(layer.topEl!==null&&layer.bottomEl!==null&&layer.topEl<layer.bottomEl)throw new Error('지층 상·하단 표고를 확인하세요.');
+ }
+ return {title:'지질주상도',area,logs};
+}