refactor(skill): remove skillsPath configuration (#310)

Remove the skillsPath field from SkillRepo and Skill structs since
recursive scanning now automatically discovers skills in all directories.
Simplify the UI by removing the path input field.

src/lib/api/deeplink.ts

@@ -33,7 +33,6 @@ export interface DeepLinkImportRequest {
   repo?: string;
   directory?: string;
   branch?: string;
-  skillsPath?: string;
 
   // Config file fields
   config?: string;