feat: migrate to docker-compose with selfhosted-supabase-mcp

- Replace legacy directory structure (api/, db/, functions/, logs/, pooler/) with
  single docker-compose.yml based self-hosted setup
- Add selfhosted-supabase-mcp TypeScript MCP server for database management
- Add .dockerignore for Docker build context
- Update .gitignore to exclude .env files, volumes/, backups, logs

selfhosted-supabase-mcp/.gitignore

@@ -0,0 +1,33 @@
+# Dependency directories
+node_modules/
+
+# Build output
+dist/
+
+.fastembed_cache
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+# Environment variables
+.env
+.env.*
+!.env.example
+
+# OS generated files
+.DS_Store
+Thumbs.db
+
+# IDE directories
+.vscode/
+.idea/
+.cursor/
+
+# Test coverage
+coverage/