feat: Implement AI script generation for audiobook projects

qwen3-tts-frontend/src/lib/api/audiobook.ts

@@ -1,5 +1,15 @@
 import apiClient from '@/lib/api'
 
+export interface ScriptGenerationRequest {
+  title: string
+  genre: string
+  subgenre?: string
+  premise: string
+  style?: string
+  num_characters?: number
+  num_chapters?: number
+}
+
 export interface AudiobookProject {
   id: number
   user_id: number
@@ -8,6 +18,7 @@ export interface AudiobookProject {
   status: string
   llm_model?: string
   error_message?: string
+  script_config?: Record<string, unknown>
   created_at: string
   updated_at: string
 }
@@ -58,6 +69,11 @@ export interface LLMConfig {
 }
 
 export const audiobookApi = {
+  createAIScript: async (data: ScriptGenerationRequest): Promise<AudiobookProject> => {
+    const response = await apiClient.post<AudiobookProject>('/audiobook/projects/generate-script', data)
+    return response.data
+  },
+
   createProject: async (data: {
     title: string
     source_type: string