Support 16 KB page sizes, and fix the build

[nsingh-ut]

Description

Makes the demo app 16 KB page-size compatible, so it runs without the OS
"Android App Compatibility" warning on Android 15+ devices, and fixes two
things that stopped the repo building at all.

1. Malformed AndroidManifest.xml (build blocker)

A duplicate <intent-filter> sat directly above the real
<intent-filter android:autoVerify="true"> with only one closing tag, so the
file was not well-formed XML and processProdDebugMainManifest failed. It came
in with the autoVerify change and has been broken on main since.

2. GPR_PACKAGE_URL placeholder (build blocker)

build.gradle declared maven { url "GPR_PACKAGE_URL" } — a literal string,
not a URL — so com.userzoom:sdk:+ had no repository to resolve from. Now
points at the public repo the SDK is actually published to, which means the
demo always picks up the latest published UZ SDK.

3. 16 KB page-size support

Measured LOAD-segment alignment of every native lib in the APK:

Library	From	Before	After
libmapbox-gl.so → libmaplibre.so	MapLibre	0x1000 ❌	0x4000 ✅
libimage_processing_util_jni.so	CameraX 1.4.2	0x4000 ✅	0x4000 ✅
libsurface_util_jni.so	CameraX 1.4.2	0x4000 ✅	0x4000 ✅
liblanguage_id_l2c_jni.so	ML Kit 17.0.5	0x4000 ✅	0x4000 ✅

MapLibre was the only offender. Bumped 10.3.0 → 11.13.5 (and the annotation
plugin 2.0.2 → 3.0.2). MapLibre 11 renamed its package
com.mapbox.mapboxsdk → org.maplibre.android and MapboxMap → MapLibreMap,
which is the bulk of the diff — mechanical renames, no logic changes.

Note that 16 KB alignment is not monotonic across MapLibre releases: 11.5.0
is aligned, 11.5.2 and 11.6.0 regress to 4 KB, 11.8.8+ are aligned again. Worth
re-checking on any future bump.

desugar_jdk_libs 2.0.4 → 2.1.5, required by UZ SDK 25.x.

Testing

Built and installed on an Android 17 (API 37) 16 KB emulator:

• APK zip alignment verified with zipalign -c -P 16 — passes
• All four native libs confirmed 0x4000 via llvm-readelf -l
• Compatibility warning no longer appears on launch
• Places map screen opens and the MapLibre GL surface renders

Map tiles did not load in my environment, but that is a local TLS
interception issue (CertPathValidatorException) that also blocks Maven
Central here — unrelated to this change. Worth a sanity check on a normal
network.

Type of change

• fix
• feature

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