docs(auth): evaluate SEP-10 adoption for auth roadmap

[Okorie2000-code]

• Adds SEP-10 protocol analysis covering challenge/verify flow
• Documents current auth gap (no backend auth middleware or protected routes)
• Recommends phased adoption: scaffold Batch 1, implement SEP-10 in Batch 2
• Identifies SEP-10-aware boundaries across packages/types, backend/, and frontend/
• Maps issue references (apps/api, apps/stellar-service) to actual repo paths

Closes #418

What this PR does

• Summary of the implemented changes related to issue(s) DevTooling: Implement Monorepo with Turborepo for Shared Packages #240 and DevTooling: Implement Real-Time Error Monitoring with Sentry and Custom Dashboards #242
• Any breaking changes introduced (if any)
• Any migrations or data changes (if applicable) Closes feat: Implement comprehensive improvements for issues #362, #363, #366, #367 #418

Changes

• List of notable files and modules touched (monorepo wiring, Sentry integration, dashboards, etc.)
• Notes about the Turborepo configuration, shared packages, and ESLint/TS config

Why

• Rationale for the changes and how they solve the Acceptance Criteria

How to test

• Steps to reproduce locally, including commands to run build/test
• Any environment variables needed (e.g., SENTRY_DSN)
• How to verify the dashboards/alerts configuration (stubs or real)

Notes

• Any caveats, risks, or follow-up tasks
• If you want to close issues automatically, include:
  • Closes DevTooling: Implement Monorepo with Turborepo for Shared Packages #240
  • Closes DevTooling: Implement Real-Time Error Monitoring with Sentry and Custom Dashboards #242

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