feat: add OpenGL abstraction layer with RAII resources

- Replace window class with cbt::opengl::context
- Add buffer resource (VBO, EBO, UBO, SSBO) with move semantics
- Add texture resource with format/type enums and filtering
- Add descriptor_set for Vulkan-style resource binding
- All resources use RAII with proper cleanup

deps/Findsqlite3.cmake

@@ -0,0 +1,46 @@
+# ==============================================================================
+# Findsqlite3.cmake
+# ==============================================================================
+# This module fetches and builds the SQLite amalgamation as a static library.
+#
+# Targets provided:
+#   sqlite3::sqlite3 - The SQLite static library target
+#
+# Variables set:
+#   sqlite3_FOUND       - TRUE if sqlite3 is available
+#   sqlite3_LIBRARIES   - The sqlite3 library target (sqlite3::sqlite3)
+#   sqlite3_INCLUDE_DIR - Include directory for sqlite3.h
+#   sqlite3_VERSION     - Version of sqlite3
+# ==============================================================================
+
+if (DEFINED _FINDSQLITE3_INCLUDED)
+    return()
+endif()
+set(_FINDSQLITE3_INCLUDED TRUE)
+
+set(SQLITE3_VERSION "3.52.0")
+
+message(STATUS "Fetching sqlite3 ${SQLITE3_VERSION}")
+
+include(FetchContent)
+
+FetchContent_Declare(
+    sqlite3_amalgamation
+    URL                        https://sqlite.org/2026/sqlite-amalgamation-3520000.zip
+    URL_HASH                   SHA3_256=3fab435106250ea1cdfd5f9fa1657ad832fd431df1d817d48af66ba166e0d16e
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+)
+
+FetchContent_MakeAvailable(sqlite3_amalgamation)
+
+if (NOT TARGET sqlite3::sqlite3)
+    add_library(sqlite3 STATIC ${sqlite3_amalgamation_SOURCE_DIR}/sqlite3.c)
+    target_include_directories(sqlite3 PUBLIC ${sqlite3_amalgamation_SOURCE_DIR})
+    target_link_libraries(sqlite3 PRIVATE ${CMAKE_DL_LIBS})
+    add_library(sqlite3::sqlite3 ALIAS sqlite3)
+endif()
+
+set(sqlite3_FOUND       TRUE)
+set(sqlite3_LIBRARIES   sqlite3::sqlite3)
+set(sqlite3_VERSION     "${SQLITE3_VERSION}")
+set(sqlite3_INCLUDE_DIR "${sqlite3_amalgamation_SOURCE_DIR}")