feat: Add SQL Query Interface

[sundy-li]

This PR introduces a comprehensive SQL query interface to BendSQL with an embedded web UI, featuring a modern CodeMirror-based SQL editor with syntax highlighting and dual routing support.

Overview

This PR introduces a comprehensive SQL query interface to BendSQL with an embedded web UI, featuring a modern CodeMirror-based SQL editor with syntax highlighting and dual routing support.

New Features

SQL Query Interface

command ./target/debug/bendsql --ui to start ui which connects to to specified dsn

• Interactive SQL Editor: Added a new React-based SQL query interface with CodeMirror integration
• Dual Routing System:
  • /perf/* routes to ProfileGraphDashboard (performance analysis)
  • All other routes default to SQLQuery interface
• Query Execution: Full SQL query execution with result display in tabular format
• Query Sharing: Support for sharing queries via unique URLs with database-generated query IDs

Backend Changes

• DuckDB Removal: Removed platform-specific DuckDB dependencies from CLI
• Introduce !install duckdb command and gendata will call duckdb cli to generate tpch/tpcds data now