Add GitHub Actions workflow and update docker-compose to use GHCR

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,30 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+
+# App data (SQLite database)
+data/
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+Thumbs.db
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Backup files
+*.bak
+*.tmp
+*.backup
+
+# Environment variables
+.env
+.env.local