docs: add server route ownership map table to backend testing docs

[Abhi200550]

Description

Fixes # (issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Verification Commands

• npm run lint / npm run test (Frontend/Backend)
• cargo fmt / cargo clippy / cargo test (Smart Contracts)

Contract Security (if contracts/ changed)

• Storage schema changes documented or migration provided
• All entry points have authorization checks
• Arithmetic uses checked operations
• New entry points have unit tests including unauthorized callers
• No new admin roles without governance proposal

Screenshots (if applicable)

Add screenshots to help explain the changes.

UI Snapshot Checklist

• Screenshots provided for Desktop (1024px+)
• Screenshots provided for Mobile (375px)
• No visual changes

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