feat(auth): add session-based auth service with tests

backend/CMakeLists.txt

@@ -6,11 +6,14 @@ cmake_policy(SET CMP0153 OLD)
 
 find_package(Drogon CONFIG REQUIRED)
 find_package(Catch2 3 REQUIRED)
+find_package(OpenSSL REQUIRED)
 
 add_library(csp_core
   src/version.cc
   src/db/sqlite_db.cc
   src/app_state.cc
+  src/services/crypto.cc
+  src/services/auth_service.cc
 )
 
 target_include_directories(csp_core PUBLIC
@@ -19,6 +22,7 @@ target_include_directories(csp_core PUBLIC
 
 target_link_libraries(csp_core PUBLIC
   SQLite3_lib
+  OpenSSL::Crypto
 )
 
 add_executable(csp_server
@@ -40,6 +44,7 @@ add_executable(csp_tests
   tests/test_main.cc
   tests/version_test.cc
   tests/sqlite_db_test.cc
+  tests/auth_service_test.cc
 )
 
 target_link_libraries(csp_tests PRIVATE