feat: add voice studio prototype flow

frontend/src/types/voiceSession.ts

@@ -0,0 +1,75 @@
+export interface VoiceTurnSummary {
+  id: string
+  session_id: string
+  turn_index: number
+  status: string
+  user_transcript: string | null
+  transcript_confidence: number | null
+  transcription_provider: string | null
+  detected_intent: string
+  intent_confidence: number | null
+  assistant_text: string | null
+  assistant_audio_ready: boolean
+  assistant_audio_url: string | null
+  user_audio_ready: boolean
+  user_audio_url: string | null
+  error_message: string | null
+  created_at: string
+  updated_at: string
+}
+
+export interface VoiceSessionEvent {
+  id: number
+  session_id: string
+  turn_id: string | null
+  event_type: string
+  status: string
+  message: string | null
+  event_metadata: Record<string, unknown>
+  created_at: string
+}
+
+export interface VoiceSessionSummary {
+  id: string
+  child_profile_id: string | null
+  universe_id: string | null
+  final_story_id: number | null
+  target_mode: string
+  status: string
+  current_turn_index: number
+  total_turns: number
+  working_title: string | null
+  story_state: Record<string, unknown>
+  latest_user_transcript: string | null
+  latest_assistant_text: string | null
+  latest_detected_intent: string | null
+  latest_assistant_audio_ready: boolean
+  last_turn_status: string | null
+  can_continue: boolean
+  can_finalize: boolean
+  last_error: string | null
+  created_at: string
+  updated_at: string
+}
+
+export interface VoiceSessionDetail extends VoiceSessionSummary {
+  recent_turns: VoiceTurnSummary[]
+  events: VoiceSessionEvent[]
+}
+
+export interface VoiceTurnAcceptedResponse {
+  turn_id: string
+  session_id: string
+  status: string
+}
+
+export interface VoiceTurnUploadAcceptedResponse extends VoiceTurnAcceptedResponse {
+  transcription_provider: string | null
+}
+
+export interface VoiceSessionFinalizeResponse {
+  session_id: string
+  status: string
+  story_id: number | null
+  generation_job_id: string | null
+}