feat(core:data): Ktor network core + coreDataModule (REDI-83)

- HttpClientFactory.create(engine) with the engine injected (MockEngine seam for tests):
  ContentNegotiation JSON (ignoreUnknownKeys), Kermit-backed Ktor logging, default JSON request.
- safeCall / responseToResult (status -> DataError.Network, extended with 400/403/404/503) /
  constructRoute (reads BuildConfig.BASE_URL) and typed HttpClient.get/post/delete.
- BASE_URL BuildConfig field = Rick & Morty API.
- coreDataModule: single<HttpClient> via factory lambda (the one sanctioned lambda-DSL binding).

core/data/build.gradle.kts

@@ -6,8 +6,17 @@ plugins {
 
 android {
     namespace = "com.example.architecture.core.data"
+
+    buildFeatures {
+        buildConfig = true
+    }
+    defaultConfig {
+        // The no-key Rick & Morty API. constructRoute() reads this BuildConfig field.
+        buildConfigField("String", "BASE_URL", "\"https://rickandmortyapi.com/api\"")
+    }
 }
 
 dependencies {
     implementation(project(":core:domain"))
+    implementation(libs.kermit)
 }