feat: add Dune-style SQL analytics dashboard

[floxxih]

Summary

• Add a secure analytics backend route at POST /api/analytics/query that only accepts single-statement SELECT queries, blocks mutating SQL keywords, enforces default row limits, and applies execution timeout safeguards.
• Add a new frontend analytics page with Monaco-based SQL editor, query execution flow, and dynamic chart rendering via Recharts.
• Wire the analytics route into app navigation and backend routing so users can run custom read-only protocol analytics from the UI.

Notes

• This implementation uses strict read-only validation and bounded query behavior for safer SQL execution.
• No tests were added per your earlier instruction.

Closes #97

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[edehvictor]

@floxxih resolve conflicts and fix CI error