Add DatabaseManager singleton with SQLite initialization and basic tables (Account, Folder, MailCopy, Attachment)

CMakeLists.txt

@@ -15,7 +15,7 @@ find_package(Qt6 COMPONENTS Core Gui Widgets Network Sql WebEngineWidgets REQUIR
 # Include directories
 include_directories(${PROJECT_SOURCE_DIR}/src)
 
-# Source files - we will add them later
+# Source files
 set(SRC_FILES
     src/main.cpp
     src/core/translator.cpp
@@ -24,6 +24,7 @@ set(SRC_FILES
     src/core/models/folder.cpp
     src/services/synchronizer.cpp
     src/services/imap/imapsynchronizer.cpp
+    src/db/databasemanager.cpp
 )
 
 # Executable
@@ -37,4 +38,4 @@ target_link_libraries(wino-mail-qt PRIVATE Qt6::Core Qt6::Gui Qt6::Widgets Qt6::
 # target_include_directories(wino-mail-qt PRIVATE ${LIBETPAN_INCLUDE_DIRS} ${GMIME_INCLUDE_DIRS})
 
 # Install (optional)
-install(TARGETS wino-mail-qt DESTINATION bin)
+install(TARGETS wino-mail-qt DESTINATION bin)