feat: integrate Sensei Spook mascot in 4 stances, speech bubbles, and style updates

types/booth.ts

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+export type BackgroundType = "color" | "video" | "image";
+
+export interface BoothTheme {
+  backgroundType: BackgroundType;
+  backgroundColor: string;
+  backgroundVideoUrl?: string;
+  backgroundImageUrl?: string;
+  primaryColor: string;
+  accentColor: string;
+  surfaceColor: string;
+  textColor: string;
+  logoUrl: string;
+  logoWidth?: number;
+}
+
+export interface CameraConfig {
+  defaultFacingMode: "user" | "environment";
+  aspectRatio: "9:16" | "3:4" | "1:1" | "4:3";
+  countdownSeconds: number;
+  allowUpload: boolean;
+  maxUploadSizeMb: number;
+}
+
+export interface FeatureFlags {
+  showQrCode: boolean;
+  showDownloadButton: boolean;
+  showPrintButton: boolean;
+  showRetakeButton: boolean;
+  showInstagramShare?: boolean;
+}
+
+export interface RateLimitsConfig {
+  maxGenerationsPerDevice: number; // 0 = unlimited
+  cooldownMinutes: number;
+}
+
+export interface AIProviderConfig {
+  provider: "gemini" | "openrouter";
+  model: string;
+  timeoutMs: number;
+}
+
+export interface AIConfig {
+  primary: AIProviderConfig;
+  backup: AIProviderConfig;
+  cooldownDurationMinutes: number;
+  enableSfwCheck: boolean;
+}
+
+export interface KioskConfig {
+  enableAutoReset: boolean;
+  idleTimeoutSeconds: number;
+}
+
+export interface LocalizedString {
+  en: string;
+  zh: string;
+}
+
+export interface BoothLabels {
+  welcomeBadge: LocalizedString;
+  welcomeTitle: LocalizedString;
+  welcomeSubtitle: LocalizedString;
+  welcomeDesc: LocalizedString;
+  welcomeCta: LocalizedString;
+  cameraInstruction: LocalizedString;
+  cameraSnap: LocalizedString;
+  cameraUpload: LocalizedString;
+  confirmTitle: LocalizedString;
+  retakeButton: LocalizedString;
+  confirmButton: LocalizedString;
+  styleSelectionTitle: LocalizedString;
+  styleSelectionSubtitle: LocalizedString;
+  confirmStyleButton: LocalizedString;
+  backButton: LocalizedString;
+  processingTitle: LocalizedString;
+  processingSubtitle: LocalizedString;
+  resultTitle: LocalizedString;
+  scanQrLabel: LocalizedString;
+  downloadLabel: LocalizedString;
+  wechatSaveTip: LocalizedString;
+  printLabel: LocalizedString;
+  startOverLabel: LocalizedString;
+  instagramShareLabel?: LocalizedString;
+}
+
+export interface BoothConfig {
+  appName: string;
+  kioskMode: boolean;
+  theme: BoothTheme;
+  camera: CameraConfig;
+  features: FeatureFlags;
+  limits: RateLimitsConfig;
+  ai: AIConfig;
+  kiosk: KioskConfig;
+  labels: BoothLabels;
+}
+
+export interface BoothStyle {
+  id: string;
+  name: LocalizedString | string;
+  description?: LocalizedString | string;
+  thumbnail: string;
+  sampleResult?: string;
+  prompt: string;
+  negativePrompt?: string;
+}
+
+export type ScreenState = 
+  | "standby"
+  | "camera"
+  | "confirm"
+  | "style"
+  | "processing"
+  | "result"
+  | "rate_limited";