Track local data: uploads and data/postgres for Gitea clone

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -3,13 +3,10 @@ dist/
 build/
 .env
 backend/.env
-data/postgres/
-!data/.gitkeep
-!data/seed/
-!data/seed/**
-uploads/*
-!uploads/.gitkeep
 *.log
 .DS_Store
 Thumbs.db
 frontend/.lan-ip
+# DB lock files (recreated on server start)
+data/postgres/postmaster.pid
+data/postgres/postmaster.opts