feat(cw): port Morse Expert 1.15 CW decoder engine (feature:cw compiles)

Full port of the CW/Morse decoder from Morse Expert 1.15
(com.ve3nea.morse_expert), preserving obfuscated class names and logic.
Ads (gms.ads), billing (BillingClient), and library code were removed per
user; SettingsActivity deferred to Compose integration.

Ported modules:
- pas.*: decoder engine interface + JNI (libnativedecoderjni.so, armeabi-v7a)
- k3.*: FFT library (pseudo-enum q rewritten from smali; sun.misc stubs
  for Unsafe/Cleaner since Android lacks them; FFT path uses float[] branch)
- i3.*, g3.*, j3.*, s.*, d1.AbstractC1518b: DSP/sin-cos tables (long[] tables
  f/f11589g restored from smali)
- H2.a/b: audio capture + decode control core (jadx catch-block illusions
  cleaned per smali; recording try/catch restored around write block)
- J2.a/b: waterfall OpenGL renderer + palette (r10 = anchor color per smali)
- E2.g: waterfall touch frequency picker (height = ScaleView per smali)
- B0.b/B.RunnableC0001b: status-bar + decoded-text UI runnables (real
  constructors recovered from smali)
- MainActivity → controller class (Activity injected; immersive status bar
  inlined); C1646n trimmed to view holder; D.n keeps waterfall texture case
- F2.a: text selection menu (Save/Share)

Verified: :feature:cw:compileDebugJavaWithJavac BUILD SUCCESSFUL.

feature/cw/src/main/java/d1/AbstractC1518b.java

@@ -0,0 +1,82 @@
+package d1;
+
+/* renamed from: d1.b, reason: case insensitive filesystem */
+/* 照搬自 Morse Expert 1.15, 混淆名保持。b(Parcel)/c(y2.d) 为库工具已裁剪(L1/y2 库依赖)。 */
+public abstract /* synthetic */ class AbstractC1518b {
+    public static float a(float f, float f4, k3.d dVar, long j4, float f5, float f6) {
+        dVar.c(j4, f - f4);
+        return f5 + f6;
+    }
+
+    public static String d(String str, int i4) {
+        return str + i4;
+    }
+
+    public static String e(String str, String str2) {
+        return str + str2;
+    }
+
+    public static String f(String str, String str2, String str3) {
+        return str + str2 + str3;
+    }
+
+    public static String g(StringBuilder sb, int i4, String str) {
+        sb.append(i4);
+        sb.append(str);
+        return sb.toString();
+    }
+
+    public static String h(StringBuilder sb, String str, String str2) {
+        sb.append(str);
+        sb.append(str2);
+        return sb.toString();
+    }
+
+    public static /* synthetic */ boolean i(Object obj) {
+        return obj != null;
+    }
+
+    public static float j(float f, float f4, k3.d dVar, long j4, float f5, float f6) {
+        dVar.c(j4, f + f4);
+        return f5 + f6;
+    }
+
+    public static String k(String str, String str2) {
+        return str + str2;
+    }
+
+    public static float l(float f, float f4, k3.d dVar, long j4, float f5, float f6) {
+        dVar.c(j4, f - f4);
+        return f5 - f6;
+    }
+
+    public static float m(float f, float f4, k3.d dVar, long j4, float f5, float f6) {
+        dVar.c(j4, f + f4);
+        return f5 - f6;
+    }
+
+    public static /* synthetic */ String n(int i4) {
+        switch (i4) {
+            case 1:
+                return "NONE";
+            case 2:
+                return "LEFT";
+            case 3:
+                return "TOP";
+            case 4:
+                return "RIGHT";
+            case 5:
+                return "BOTTOM";
+            case 6:
+                return "BASELINE";
+            case 7:
+                return "CENTER";
+            case 8:
+                return "CENTER_X";
+            case 9:
+                return "CENTER_Y";
+            default:
+                throw null;
+        }
+    }
+}