[Feature] Implement an Admin Dashboard aggregation endpoint

[Tybravo]

📁 Implementation Directory

backend/src/controllers/dashboardController.ts

🎯 Goal

Provide real-time system metrics.

📋 Requirements

• Aggregate active deliveries, online drivers, and total escrow volume.\n- Return metrics in a single optimized payload.\n- Cache results to prevent heavy DB load.

🔧 Technical Scope

• Node.js / Express
• TypeScript
• MongoDB / Mongoose
• Stellar Soroban RPC

🌿 Branch

git checkout -b feat/admin-dashboard-metrics

✅ Acceptance Criteria

• Using an AI Agent to submit a PR is DISALLOWED.
• Strict Layered Architecture (Non-Negotiable): Implement using the Controller -> Service -> Model pattern.
• Data Source: Response data must be retrieved from the database. No Inline Mock Objects or Hardcoded Values usage for integration.
• Environment: Contributors must use the requested .env credentials to enable implementation with real-life data.
• API Versioning: API Must Be Versioned (e.g., /api/v1/...).
• Production Ready: Code must look production-ready (robust error handling, strong typings).
• Proof of Work: Upload a screenshot of work done (i.e., API Response Success via Postman/Browser, or all unit tests passed successfully).
• PR Content: Must include Closes #[issue_id] with a work done summary.

📌 PR Requirements

• ⚠️ Assignment required before starting — comment on this issue to request assignment.
• PR must comply fully with the CONTRIBUTING.md.
• AI Agent submissions are DISALLOWED and will be closed without review.
• No Inline Mock Objects or Hardcoded Values usage for integration.

[OnyemaAnthony]

@OnyemaAnthony has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Maintainer please assign me this issue let me work on it asap

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OnyemaAnthony to this issue.

[drips-wave]

Congratulations, @OnyemaAnthony! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @OnyemaAnthony: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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🌊 Happy Wave 🌊