fix(admin): 渠道模型 - 补充 1440P 分辨率并支持自定义档位

backend/internal/service/model_capability.go

@@ -540,6 +540,9 @@ func ratioValue(value string) float64 {
 func normalizeResolution(value string) string {
 	value = strings.ToLower(strings.TrimSpace(value))
 	value = strings.TrimSuffix(value, "p")
+	if value == "2k" {
+		return "1440p"
+	}
 	if value == "4k" {
 		return "2160p"
 	}

backend/internal/service/model_capability_test.go

@@ -82,3 +82,18 @@ func TestDefaultVideoCapabilityUsesProtocolSpecificResolutionTiers(t *testing.T)
 		})
 	}
 }
+
+func TestNormalizeResolutionSupportsCommonAliases(t *testing.T) {
+	tests := map[string]string{
+		"1440":  "1440p",
+		"1440p": "1440p",
+		"2K":    "1440p",
+		"4K":    "2160p",
+		"768P":  "768p",
+	}
+	for input, want := range tests {
+		if got := normalizeResolution(input); got != want {
+			t.Fatalf("normalizeResolution(%q) = %q, want %q", input, got, want)
+		}
+	}
+}