fix(scripts): disable MSYS path translation in migrate-local-db-to-server.sh

pg_dump inside the container failed with "could not open output file
C:/Users/.../Temp/studioflow_migration_....dump" - Git Bash/MSYS was
rewriting the /tmp/... argument into a Windows path before handing it
to docker.exe, even though it's meant to be interpreted inside the
Linux container. MSYS_NO_PATHCONV=1 stops that translation.

scripts/migrate-local-db-to-server.sh

@@ -16,6 +16,11 @@
 
 set -euo pipefail
 
+# Git Bash/MSYS auto-translates POSIX-looking path args (e.g. /tmp/foo) into
+# Windows paths before handing them to docker.exe - but these paths are meant
+# to be interpreted inside the Linux container, not on the Windows host.
+export MSYS_NO_PATHCONV=1
+
 # ── Fill these in ──────────────────────────────────────────────────────────
 SSH_USER="${SSH_USER:-dummyuser}"
 SSH_HOST="${SSH_HOST:-dummy.server.example}"