refactor: rename dashboards→webviews, unique applicationId per flavor

Each flavor gets applicationIdSuffix = ".<name>" so the Bravia
getApplicationList API returns a distinct URI per webview, enabling
Control4 to launch specific flavors independently.

BREAKING CHANGE: applicationId changed from cz.c3c.webviewkiosk to
cz.c3c.webviewkiosk.<flavor> — uninstall old app before reinstalling.
BuildConfig.DASHBOARD_URL renamed to WEBVIEW_URL.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/build.gradle.kts

@@ -6,8 +6,8 @@ plugins {
 }
 
 @Suppress("UNCHECKED_CAST")
-val dashboards: Map<String, Map<String, String>> =
-    Yaml().load(rootProject.file("dashboards.yaml").inputStream())
+val webviews: Map<String, Map<String, String>> =
+    Yaml().load(rootProject.file("webviews.yaml").inputStream())
 
 android {
     namespace = "cz.c3c.webviewkiosk"
@@ -41,13 +41,14 @@ android {
         }
     }
 
-    flavorDimensions += "dashboard"
+    flavorDimensions += "webview"
 
     productFlavors {
-        dashboards.forEach { (name, config) ->
+        webviews.forEach { (name, config) ->
             create(name) {
-                dimension = "dashboard"
-                buildConfigField("String", "DASHBOARD_URL", "\"${config["url"]}\"")
+                dimension = "webview"
+                applicationIdSuffix = ".$name"
+                buildConfigField("String", "WEBVIEW_URL", "\"${config["url"]}\"")
                 resValue("string", "app_name", config["label"] ?: name)
             }
         }