fix: 유산 강화 범위 오류를 한국어로 안내

app/game-api/src/router/inherit/index.ts

@@ -38,6 +38,8 @@ const BUFF_KEYS: InheritBuffType[] = [
 const UNIQUE_ITEM_SLOT_ORDER: readonly ItemSlot[] = ['horse', 'weapon', 'book', 'item'];
 
 const POSTGRES_INTEGER_MAX = 2_147_483_647;
+const MIN_INHERIT_BUFF_LEVEL = 1;
+const MAX_INHERIT_BUFF_LEVEL = 5;
 
 const parseBuffRecord = (raw: unknown): Record<string, number> => {
     if (typeof raw === 'string') {
@@ -302,7 +304,7 @@ export const inheritRouter = router({
         .input(
             z.object({
                 type: z.enum(BUFF_KEYS),
-                level: z.number().int().min(1).max(5),
+                level: z.number().int(),
             })
         )
         .mutation(async ({ ctx, input }) => {
@@ -310,6 +312,12 @@ export const inheritRouter = router({
             if (!userId) {
                 throw new TRPCError({ code: 'UNAUTHORIZED' });
             }
+            if (input.level < MIN_INHERIT_BUFF_LEVEL || input.level > MAX_INHERIT_BUFF_LEVEL) {
+                throw new TRPCError({
+                    code: 'BAD_REQUEST',
+                    message: '유산 강화는 1단계부터 5단계까지만 구입할 수 있습니다.',
+                });
+            }
 
             const result = await requestInheritanceAction(ctx, userId, {
                 action: 'buyHiddenBuff',

app/game-api/test/inheritRouter.test.ts

@@ -285,6 +285,21 @@ describe('inherit router actor and permission boundaries', () => {
         });
     });
 
+    it('rejects an out-of-range inheritance buff level with a user-facing message', async () => {
+        const fixture = buildContext({});
+
+        await expect(
+            appRouter.createCaller(fixture.context).inherit.buyHiddenBuff({
+                type: 'warAvoidRatio',
+                level: 6,
+            })
+        ).rejects.toMatchObject({
+            code: 'BAD_REQUEST',
+            message: '유산 강화는 1단계부터 5단계까지만 구입할 수 있습니다.',
+        });
+        expect(fixture.requestCommand).not.toHaveBeenCalled();
+    });
+
     it('reports the Ref S100 stat-reset ban and maps the authoritative daemon rejection', async () => {
         const fixture = buildContext({
             configMap: { targetGeneralPool: 'SPoolUnderU100' },