feat(backend): add sqlite migrations + app state + tests

backend/CMakeLists.txt

@@ -9,13 +9,17 @@ find_package(Catch2 3 REQUIRED)
 
 add_library(csp_core
   src/version.cc
+  src/db/sqlite_db.cc
+  src/app_state.cc
 )
 
 target_include_directories(csp_core PUBLIC
   ${CMAKE_CURRENT_SOURCE_DIR}/include
 )
 
-# SQLite will be used via Drogon DB client in later iterations.
+target_link_libraries(csp_core PUBLIC
+  SQLite3_lib
+)
 
 add_executable(csp_server
   src/main.cc
@@ -35,6 +39,7 @@ enable_testing()
 add_executable(csp_tests
   tests/test_main.cc
   tests/version_test.cc
+  tests/sqlite_db_test.cc
 )
 
 target_link_libraries(csp_tests PRIVATE