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/k3/q.java

@@ -0,0 +1,68 @@
+package k3;
+
+/**
+ * R8 生成的伪 enum(k3 FFT 库的数组类型枚举)。
+ * smali 中 q 的直接子类:l(LONG/5)、m(FLOAT/6)、n(DOUBLE/7),
+ * 其余常量(BYTE/UNSIGNED_BYTE/SHORT/INT/COMPLEX_FLOAT/COMPLEX_DOUBLE/STRING/OBJECT)
+ * 直接以 q 实例表达。
+ */
+public class q {
+    public static final l f;
+
+    /* renamed from: g, reason: collision with root package name */
+    public static final m f12106g;
+
+    /* renamed from: h, reason: collision with root package name */
+    public static final n f12107h;
+
+    /* renamed from: i, reason: collision with root package name */
+    public static final /* synthetic */ q[] f12108i;
+
+    private final String name;
+    private final int ordinal;
+
+    protected q(String name, int ordinal) {
+        this.name = name;
+        this.ordinal = ordinal;
+    }
+
+    public final String name() {
+        return name;
+    }
+
+    public final int ordinal() {
+        return ordinal;
+    }
+
+    public static q valueOf(String str) {
+        for (q qVar : f12108i) {
+            if (qVar.name.equals(str)) {
+                return qVar;
+            }
+        }
+        throw new IllegalArgumentException("No enum constant k3.q." + str);
+    }
+
+    public static q[] values() {
+        return (q[]) f12108i.clone();
+    }
+
+    static {
+        q logic = new q("LOGIC", 0);
+        q byteType = new q("BYTE", 1);
+        q unsignedByte = new q("UNSIGNED_BYTE", 2);
+        q shortType = new q("SHORT", 3);
+        q intType = new q("INT", 4);
+        l longType = new l();
+        f = longType;
+        m floatType = new m();
+        f12106g = floatType;
+        n doubleType = new n();
+        f12107h = doubleType;
+        q complexFloat = new q("COMPLEX_FLOAT", 8);
+        q complexDouble = new q("COMPLEX_DOUBLE", 9);
+        q string = new q("STRING", 10);
+        q object = new q("OBJECT", 11);
+        f12108i = new q[]{logic, byteType, unsignedByte, shortType, intType, longType, floatType, doubleType, complexFloat, complexDouble, string, object};
+    }
+}