refactor(webserver)!: move the Development UI into a separate google-adk-kotlin-webserver-dev artifact

`google-adk-kotlin-webserver` no longer bundles the compiled Development UI, so a deployment that only serves agents over HTTP no longer carries it. Add `com.google.adk:google-adk-kotlin-webserver-dev` alongside it to serve `/dev-ui` during local development. The two modules now live under a common source root, at `webserver/api` and `webserver/dev`. Published artifact names are unchanged

PiperOrigin-RevId: 967036660

Author: sherryfox

README.md

@@ -151,7 +151,7 @@ subprojects {
   // Publishing is configured once here for any subproject that applies
   // Gradle's built-in `maven-publish` plugin. Per-module build files set the
   // `artifactId` on the publications the Kotlin / Android plugins auto-create
-  // (see core/, a2a/, firebase/, processor/, webserver/). POM metadata,
+  // (see core/, a2a/, firebase/, processor/, webserver/api/). POM metadata,
   // Dokka-fed javadoc jars, and GPG signing are configured centrally here.
   plugins.withId("maven-publish") {
     apply(plugin = "signing")

build.gradle.kts

@@ -40,7 +40,11 @@ project(":google-adk-kotlin-processor").projectDir = file("processor")
 
 include(":google-adk-kotlin-webserver")
 
-project(":google-adk-kotlin-webserver").projectDir = file("webserver")
+project(":google-adk-kotlin-webserver").projectDir = file("webserver/api")
+
+include(":google-adk-kotlin-webserver-dev")
+
+project(":google-adk-kotlin-webserver-dev").projectDir = file("webserver/dev")
 
 include(":google-adk-kotlin-integrations")
 

settings.gradle.kts

@@ -63,5 +63,3 @@ dependencies {
   testImplementation(libs.google.truth)
   testImplementation(libs.junit)
 }
-
-tasks.named<ProcessResources>("processResources") { from("browser") { into("browser") } }

webserver/build.gradle.kts webserver/api/build.gradle.ktswebserver/build.gradle.kts renamed to webserver/api/build.gradle.kts

@@ -17,7 +17,6 @@
 package com.google.adk.kt.webserver.routes
 
 import com.google.adk.kt.webserver.loaders.AgentLoader
-import io.ktor.http.HttpStatusCode
 import io.ktor.server.application.call
 import io.ktor.server.response.respond
 import io.ktor.server.routing.Route