ADFA-3078: Search the on-device Maven repo before the remote ones

Offline builds failed unless the user turned on the --offline flag, which
defeats the point of an offline-first IDE.

The on-device repo was registered last. Templates declare gradlePluginPortal(),
google() and mavenCentral() first, and this plugin appended with
`maven { it.url = uri }`. With no network, dl.google.com fails DNS, and Gradle
treats a repository *error* as fatal rather than falling through to the next
repository the way it does for a 404. Resolution therefore died at google() and
never reached the local repo. --offline worked only because it skips remote
repositories entirely.

The artifacts were never missing: the AGP plugin marker,
kotlin-build-tools-compat and kotlin-build-tools-impl are all present in
localMvnRepository on device.

Inserting at index 0 instead of appending fixes all four injection points
(pluginManagement, dependencyResolutionManagement, and the settings and project
buildscript blocks).

Verified on a Pixel 9 Pro emulator in airplane mode with offlineMode=false, the
Gradle modules-2 cache deleted, and a brand new Empty Activity Kotlin project
whose settings.gradle.kts was left untouched: sync reaches "Project initialized"
and the build produces app-debug.apk. Both failed under identical conditions
before this change. A warm module cache masks the bug, so retests need the cache
cleared.

Ships in the APK, not the assets zip, so no asset rebuild is required.

Claude-Session: https://claude.ai/code/session_017HGpMsUzZ5wxCfMtDZ2HGP

Author: Daniel-ADFA

gradle-plugin/src/main/java/com/itsaky/androidide/gradle/COTGSettingsPlugin.kt

@@ -116,8 +116,13 @@ private fun RepositoryHandler.addMavenRepoIfMissing(
 	logger: Logger,
 	uri: URI,
 ) {
-	if (none { it is MavenArtifactRepository && it.url == uri }) {
-		logger.info("Adding maven repository: $uri")
-		maven { it.url = uri }
+	if (any { it is MavenArtifactRepository && it.url == uri }) {
+		return
 	}
+
+	logger.info("Adding maven repository: $uri")
+	val repo = maven { it.url = uri }
+
+	remove(repo)
+	add(0, repo)
 }