feat: enhance agent orchestration, knowledge flow and UI refinements

frontend/src/api/skill.ts

@@ -11,6 +11,7 @@ export interface Skill {
   required_context: string[]
   output_format: string | null
   visibility: 'private' | 'team' | 'market'
+  is_builtin: boolean
   team_id: string | null
   is_active: boolean
   owner_id: string
@@ -52,4 +53,5 @@ export const skillApi = {
   create: (data: SkillCreate): Promise<AxiosResponse<Skill>> => api.post('/api/skills', data),
   update: (id: string, data: SkillUpdate): Promise<AxiosResponse<Skill>> => api.put(`/api/skills/${id}`, data),
   delete: (id: string): Promise<AxiosResponse<void>> => api.delete(`/api/skills/${id}`),
+  bootstrapBuiltin: (): Promise<AxiosResponse<Skill[]>> => api.post('/api/skills/bootstrap-builtin'),
 }