revert: remove fldigi CW decoder migration, keep Morse Expert

feature/cw/build.gradle.kts

@@ -7,24 +7,13 @@ plugins {
 
 android {
     namespace = "com.rtbishop.look4sat.feature.cw"
-    ndkVersion = "25.2.9519653"
     compileOptions {
         encoding = "UTF-8"
     }
+    // 照搬 Morse Expert 1.15: native 解码器仅 armeabi-v7a
     defaultConfig {
-        // fldigi CW 解码器: 支持 arm64-v8a + armeabi-v7a 双架构
         ndk {
-            abiFilters += listOf("arm64-v8a", "armeabi-v7a")
-        }
-        externalNativeBuild {
-            cmake {
-                cppFlags += "-std=c++17"
-            }
-        }
-    }
-    externalNativeBuild {
-        cmake {
-            path = file("src/main/cpp/CMakeLists.txt")
+            abiFilters += listOf("armeabi-v7a")
         }
     }
 }
@@ -37,4 +26,13 @@ androidComponents {
             project.layout.projectDirectory.file("proguard-rules.pro")
         )
     }
-}
+}
+
+dependencies {
+    implementation("androidx.constraintlayout:constraintlayout:2.2.1")
+}
+
+// 照搬的 Java 源码含中文注释, 强制 UTF-8 编译(compileOptions 在部分 AGP 版本不生效)
+tasks.withType<JavaCompile>().configureEach {
+    options.encoding = "UTF-8"
+}