refactor: ImGui EGL renderer + JNI data bridge + IME

Replace custom GLES ImGui with official imgui_impl_opengl3 + imgui_impl_android
backends. Add three-layer JNI data bridge (Java -> C -> C#) with string-keyed
DataSlot routing. Implement one-shot Android IME via hidden EditText with
WantTextInput-driven keyboard control.

New:
- ImGuiRender.cs: EGL rendering, touch hook, keyboard IME
- ImGuiImplAndroid.cs: official Android backend binding
- JniHelperNative.cs / JniWrapper.cs: JNI P/Invoke and RAII wrappers
- AndroidIME.cs: IME show/hide via JavaClass vtable
- DL.cs: dlopen P/Invoke for dynamic linking
- MotionInputProvider.cs / MotionEventHook.cs: touch input
- jni_helper.c/h: JNI helpers + DataSlot bridge
- ModManagerUtils.java: hidden EditText IME + native data bridge
- cimgui_backends.patch: add Android/OpenGL backends to cimgui build
- README.md

Changed:
- Rename monodroid-coreclr.c -> mono_droid_coreclr.c
- Rename jnihelper.c/h -> jni_helper.c/h
- CMakeLists.txt: cimgui patch auto-apply, source renames
- UnityResolve.cs: expanded IL2CPP/Mono reflection
- Mono.cs: restructured loader entry
- .gitignore: add build outputs

Removed:
- ImGuiGLES.cs: replaced by official backends
- ModManagerUI.cs: replaced by ImGuiRender
- build-project.sh: no longer needed

Author: StArraySharp

.gitignore

@@ -43,6 +43,7 @@ project.lock.json
 
 # Unity test project (exclude entire dir)
 TestAndroidProject/
+TestAndroidProject2/
 
 # Runtime data (mods, etc — user-managed)
 Runtime/

Android/library/build.gradle

@@ -8,7 +8,7 @@ android {
     ndkVersion "27.2.12479018"
 
     defaultConfig {
-        minSdk 21
+        minSdk 26
         targetSdk 35
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

Android/library/src/main/cpp/CMakeLists.txt

@@ -18,14 +18,17 @@ else()
     add_compile_options(-O2 -DNDEBUG)
 endif()
 
+add_compile_options(-Wno-deprecated-declarations)
+
 # ---- Source files ----
 set(MODLOADER_SOURCES
     core/dobby_hook.cpp
     core/unity_resolve.cpp
+    core/jni_helper.c
 )
 
 set(MONODROID_SOURCES
-    core/monodroid-coreclr.c
+    core/mono_droid_coreclr.c
 )
 
 # ---- libmodloader.so (Dobby + UnityResolve + log_write) ----
@@ -58,8 +61,29 @@ set_target_properties(clrjit PROPERTIES
 # ---- cimgui: build from source as shared library ----
 set(IMGUI_STATIC OFF CACHE BOOL "" FORCE)
 set(IMGUI_FREETYPE OFF CACHE BOOL "" FORCE)
+
+# Apply cimgui backends patch (--forward skips already-applied hunks)
+set(CIMGUI_DIR ${CMAKE_CURRENT_SOURCE_DIR}/libs/cimgui)
+set(CIMGUI_PATCH ${CMAKE_CURRENT_SOURCE_DIR}/libs/cimgui_backends.patch)
+
+if(EXISTS ${CIMGUI_PATCH})
+    execute_process(
+        COMMAND patch --forward -p1 -i ${CIMGUI_PATCH}
+        WORKING_DIRECTORY ${CIMGUI_DIR}
+        RESULT_VARIABLE PATCH_RESULT
+    )
+    if(PATCH_RESULT EQUAL 0)
+        message(STATUS "cimgui backends patch applied")
+    endif()
+endif()
+
 add_subdirectory(libs/cimgui ${CMAKE_CURRENT_BINARY_DIR}/cimgui)
 
+# Clean up stale patch marker (no longer used, dry-run detection replaced it)
+set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_CLEAN_FILES
+    "${CIMGUI_DIR}/.backends_patched"
+)
+
 # ---- Include directories (modloader) ----
 target_include_directories(modloader
     PRIVATE
@@ -85,6 +109,7 @@ target_link_libraries(modloader
     ${log-lib}
     dobby
     cimgui
+    android
 )
 
 # ---- Post-build: copy libcimgui.so alongside libmodloader.so ----