overlay: pawlet framework takes precedence; make SystemUI overlay static

- pawlet-framework-res-overlay priority 1 -> 3 so PawletOS framework config
  overrides device-specific (pawlet-rpi=2) and base (androidrpi/tv=1).
- pawlet-systemui-overlay was non-static (disabled at boot); add
  android:isStatic="true" so its SystemUI overrides actually apply.

overlay/frameworks/base/core/res/AndroidManifest.xml

@@ -6,10 +6,12 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="me.pawlet.overlay.framework.runtime">
 
+    <!-- priority 3: PawletOS framework config takes control over device-specific
+         (pawlet-rpi = 2) and base (AndroidRpiOverlay/AndroidTvRpiOverlay = 1). -->
     <overlay
         android:targetPackage="android"
         android:isStatic="true"
-        android:priority="1" />
+        android:priority="3" />
 
     <application
         android:label="PawletOS Framework Overlay"

overlay/systemui/AndroidManifest.xml

@@ -8,6 +8,7 @@
 
     <overlay
         android:targetPackage="com.android.systemui"
+        android:isStatic="true"
         android:priority="1" />
 
     <application