[Android] MATSDK_ANDROID_USE_ROOM=OFF is ignored; AAR always builds with Room #1550

Since #1511, lib/android_build/maesdk/src/main/cpp/CMakeLists.txt:9 has:

set(MATSDK_ANDROID_USE_ROOM ON CACHE BOOL "" FORCE)

FORCE overrides the -DMATSDK_ANDROID_USE_ROOM=OFF passed from build.gradle, so the SQLite option described in docs/cpp-start-android.md no longer works.

On v3.10.279.1, with -DMATSDK_ANDROID_USE_ROOM=OFF set in both module build.gradle files:

• The Gradle-generated CMake command passes -DMATSDK_ANDROID_USE_ROOM=OFF.
• CMakeCache.txt ends up with MATSDK_ANDROID_USE_ROOM:BOOL=ON.
• Only OfflineStorage_Room.cpp is compiled, and libmaesdk.so contains no OfflineStorage_SQLite symbols.

Room storage is therefore used even when SQLite is selected, which breaks hosts that don't call OfflineRoom.connectContext().

Separately, the legacy -DUSE_ROOM flag is now silently ignored.