diff --git a/.ai/module-registry.md b/.ai/module-registry.md
index dc6d311..b034651 100644
--- a/.ai/module-registry.md
+++ b/.ai/module-registry.md
@@ -6,3 +6,4 @@
 | --- | --- | --- |
 | cash-sale | src/modules/cash-sale.ts | 已註冊 |
 | pickup-point | src/modules/pickup-point.ts | 已註冊 |
+| receipt-template | src/modules/receipt-template.ts | 已註冊 |
diff --git a/src/modules/receipt-template.ts b/src/modules/receipt-template.ts
new file mode 100644
index 0000000..8c4db1f
--- /dev/null
+++ b/src/modules/receipt-template.ts
@@ -0,0 +1,19 @@
+/**
+ * 票據模板模組（沙盤推演示意）
+ */
+
+/** 票據版型識別碼 */
+export type ReceiptLayout = "thermal" | "a4";
+
+/** 票據模板設定 */
+export interface ReceiptTemplate {
+  /** 模板唯一識別碼 */
+  templateId: string;
+  /** 版型：熱感紙或 A4 */
+  layout: ReceiptLayout;
+  /** 模板標題，顯示於票據頂部 */
+  headerText: string;
+}
+
+/** 依版型查詢可用模板 */
+export const listTemplates = (layout: ReceiptLayout): ReceiptTemplate[] => [];