feat: add Script Builder frontend types and API client

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/index.ts

@@ -30,3 +30,4 @@ export { flowpilotAnalyticsApi } from './flowpilotAnalytics'
 export { notificationsApi } from './notifications'
 export { publicTemplatesApi } from './publicTemplates'
 export { uploadsApi, default as uploadsApiDefault } from './uploads'
+export { scriptBuilderApi } from './scriptBuilder'

frontend/src/api/scriptBuilder.ts

@@ -0,0 +1,47 @@
+import { apiClient } from './client'
+import type {
+  ScriptBuilderSessionSummary,
+  ScriptBuilderSessionDetail,
+  ScriptBuilderMessageResponse,
+  SaveToLibraryRequest,
+} from '@/types'
+import type { ScriptTemplateDetail } from '@/types'
+
+export const scriptBuilderApi = {
+  async createSession(language: string): Promise<ScriptBuilderSessionDetail> {
+    const { data } = await apiClient.post('/scripts/builder/sessions', { language })
+    return data
+  },
+
+  async listSessions(limit = 20, offset = 0): Promise<ScriptBuilderSessionSummary[]> {
+    const { data } = await apiClient.get('/scripts/builder/sessions', {
+      params: { limit, offset },
+    })
+    return data
+  },
+
+  async getSession(sessionId: string): Promise<ScriptBuilderSessionDetail> {
+    const { data } = await apiClient.get(`/scripts/builder/sessions/${sessionId}`)
+    return data
+  },
+
+  async sendMessage(sessionId: string, content: string): Promise<ScriptBuilderMessageResponse> {
+    const { data } = await apiClient.post(
+      `/scripts/builder/sessions/${sessionId}/messages`,
+      { content }
+    )
+    return data
+  },
+
+  async deleteSession(sessionId: string): Promise<void> {
+    await apiClient.delete(`/scripts/builder/sessions/${sessionId}`)
+  },
+
+  async saveToLibrary(sessionId: string, req: SaveToLibraryRequest): Promise<ScriptTemplateDetail> {
+    const { data } = await apiClient.post(
+      `/scripts/builder/sessions/${sessionId}/save`,
+      req
+    )
+    return data
+  },
+}