fix(server/reward): TG bot 回复区分已领取/未加入两态 + 按 Telegram language_code 中英双语

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu

server/internal/reward/telegram_webhook_test.go

@@ -25,17 +25,17 @@ func TestClaimTelegram_MemberGrantsOnce(t *testing.T) {
 	db := openDB(t)
 	seedU(t, db, 1, "u1")
 	s := newTgSvc(t, db, true)
-	ok, err := s.ClaimTelegram(context.Background(), 1, "tg-777")
-	if err != nil || !ok {
-		t.Fatalf("claim1: %v %v", ok, err)
+	res, err := s.ClaimTelegram(context.Background(), 1, "tg-777")
+	if err != nil || res != ClaimGranted {
+		t.Fatalf("claim1: %v %v", res, err)
 	}
 	if d := proDays(t, db, 1); d < 3 {
 		t.Fatalf("pro days=%d", d)
 	}
-	// 再领 → 不再发(唯一守卫)
-	ok2, _ := s.ClaimTelegram(context.Background(), 1, "tg-777")
-	if ok2 {
-		t.Fatalf("claimed twice")
+	// 再领 → 已领取过(唯一守卫),不再发
+	res2, err2 := s.ClaimTelegram(context.Background(), 1, "tg-777")
+	if err2 != nil || res2 != ClaimAlready {
+		t.Fatalf("claim2: %v %v", res2, err2)
 	}
 }
 
@@ -43,11 +43,32 @@ func TestClaimTelegram_NonMemberNoGrant(t *testing.T) {
 	db := openDB(t)
 	seedU(t, db, 1, "u1")
 	s := newTgSvc(t, db, false)
-	ok, _ := s.ClaimTelegram(context.Background(), 1, "tg-1")
-	if ok {
-		t.Fatalf("non-member granted")
+	res, err := s.ClaimTelegram(context.Background(), 1, "tg-1")
+	if err != nil || res != ClaimNotMember {
+		t.Fatalf("claim: %v %v", res, err)
 	}
 	if d := proDays(t, db, 1); d >= 3 {
 		t.Fatalf("granted days to non-member: %d", d)
 	}
 }
+
+func TestTgMsgSetFor_LanguageSelection(t *testing.T) {
+	cases := []struct {
+		lang string
+		zh   bool
+	}{
+		{"zh-hans", true},
+		{"zh", true},
+		{"zh-CN", true},
+		{"en", false},
+		{"de", false},
+		{"", false},
+	}
+	for _, c := range cases {
+		got := tgMsgSetFor(c.lang)
+		isZH := got.granted == tgMsgsZH.granted
+		if isZH != c.zh {
+			t.Fatalf("lang=%q: expected zh=%v, got zh=%v", c.lang, c.zh, isZH)
+		}
+	}
+}