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;

src/lib/api/skills.ts

@@ -10,7 +10,6 @@ export interface Skill {
   repoOwner?: string;
   repoName?: string;
   repoBranch?: string;
-  skillsPath?: string; // 技能所在的子目录路径，如 "skills"
 }
 
 export interface SkillRepo {
@@ -18,7 +17,6 @@ export interface SkillRepo {
   name: string;
   branch: string;
   enabled: boolean;
-  skillsPath?: string; // 可选：技能所在的子目录路径，如 "skills"
 }
 
 export const skillsApi = {