Add Android Studio project for OpenGL renderer integration

[mrpollo]

Brings the Android Studio project work from #78 into main. The original PR by @diegurrio was merged into feature/android_integration instead of main, so this re-targets the same change against main.

Cherry-picks commit 8001740 (squash-merge of #78) onto main — no code changes, same diff as the original PR.

Original PR summary (#78)

Integrates Hawkeye's C/Raylib renderer into an Android NativeActivity app. Uses Raylib 5.5's Android backend (OpenGL ES 3.0) with the rendering subset of the Hawkeye engine (scene, vehicle, theme) — no MAVLink/ULog dependencies.

• android/: Android Studio project (Gradle + NDK + CMake)
• android/app/src/main/cpp/CMakeLists.txt: fetches Raylib 5.5, compiles scene.c/vehicle.c/theme.c/asset_path.c/ortho_panel.c as libhawkeye.so
• android/app/src/main/cpp/android_main.c: entry point — static quadrotor scene with grid ground plane and lighting shader
• android/app/src/main/assets/shaders/: OpenGL ES 3.0 shader variants (#version 300 es) of the desktop grid and lighting shaders
• android/app/src/main/assets/{models,fonts,themes}: relative symlinks to repo-root asset directories (portable across clones)
• ANativeActivity_onCreate exported via -Wl,-u linker flag

Original PR: #78
Author: @diegurrio

[diegurrio]

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