Switch clash-foss submodule default branch to Meta

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Goooler <10363352+Goooler@users.noreply.github.com>
Co-authored-by: Zongle Wang <wangzongler@gmail.com>

Author: Copilot

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "clash-foss"]
 	path = core/src/foss/golang/clash
 	url = https://github.com/MetaCubeX/mihomo
-	branch = Alpha
+	branch = Meta

build.gradle.kts

@@ -98,7 +98,6 @@ subprojects {
             val removeSuffix = (queryConfigProperty("remove.suffix") as? String)?.toBoolean() == true
 
             create("alpha") {
-                isDefault = true
                 dimension = flavorDimensionList[0]
                 if (!removeSuffix) {
                     versionNameSuffix = ".Alpha"
@@ -116,7 +115,7 @@ subprojects {
             }
 
             create("meta") {
-
+                isDefault = true
                 dimension = flavorDimensionList[0]
                 if (!removeSuffix) {
                     versionNameSuffix = ".Meta"