feat: add skill API client

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/api/skill.ts

@@ -0,0 +1,55 @@
+import api from './index'
+import type { AxiosResponse } from 'axios'
+
+export interface Skill {
+  id: string
+  name: string
+  description: string | null
+  instructions: string
+  agent_type: string
+  tools: string[]
+  required_context: string[]
+  output_format: string | null
+  visibility: 'private' | 'team' | 'market'
+  team_id: string | null
+  is_active: boolean
+  owner_id: string
+  created_at: string
+  updated_at: string
+}
+
+export interface SkillCreate {
+  name: string
+  description?: string
+  instructions: string
+  agent_type: string
+  tools?: string[]
+  required_context?: string[]
+  output_format?: string
+  visibility?: 'private' | 'team' | 'market'
+  team_id?: string
+  is_active?: boolean
+}
+
+export interface SkillUpdate {
+  name?: string
+  description?: string
+  instructions?: string
+  agent_type?: string
+  tools?: string[]
+  required_context?: string[]
+  output_format?: string
+  visibility?: 'private' | 'team' | 'market'
+  team_id?: string
+  is_active?: boolean
+}
+
+export const skillApi = {
+  list: (params?: { agent_type?: string; visibility?: string }): Promise<AxiosResponse<Skill[]>> => {
+    return api.get('/api/skills', { params })
+  },
+  get: (id: string): Promise<AxiosResponse<Skill>> => api.get(`/api/skills/${id}`),
+  create: (data: SkillCreate): Promise<AxiosResponse<Skill>> => api.post('/api/skills', data),
+  update: (id: string, data: SkillUpdate): Promise<AxiosResponse<Skill>> => api.put(`/api/skills/${id}`, data),
+  delete: (id: string): Promise<AxiosResponse<void>> => api.delete(`/api/skills/${id}`),
+}