feat: add backend_v1 migration

backend_v1/.gitignore

@@ -0,0 +1,27 @@
+bin/*
+vendor/
+__debug_bin*
+backend
+build/*
+.vscode
+.idea
+tmp/
+docker-compose.yml
+sqlite.db
+go.work
+go.work.sum
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/