[+] Link card limit on the backend

src/main/java/icu/samnyan/aqua/net/utils/AquaNetProps.kt

@@ -0,0 +1,10 @@
+package icu.samnyan.aqua.net.utils
+
+import org.springframework.boot.context.properties.ConfigurationProperties
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+@ConfigurationProperties(prefix = "aqua-net")
+class AquaNetProps {
+    var linkCardLimit: Int = 10
+}