chore: setup Winston/Morgan logging and standardize application logs (#35)

[gidadoabdullateef5]

PR: Setup Winston/Morgan Logging (#35)

📋 Summary

Standardized the backend logging infrastructure by migrating from raw console calls to a centralized, structured logging system using Winston and Morgan.

---

🚀 Proposed Changes

1. 🏗️ Infrastructure Setup

• Added winston for professional, file-based structured logging.
• Integrated morgan for automated HTTP request logging.
• Configured log rotation and persistence in the logs/ directory.

2. 🧹 Codebase Migration

Replaced over 50+ instances of console.log, console.error, and console.warn with:

• logger.info(): General application flow.
• logger.error(): Internal errors and transaction failures.
• logger.warn(): Performance alerts and fallback triggers.

3. 🛡️ Affected Services

• Market Rates: marketRateService.ts, KES/GHS/NGN fetchers.
• Stellar Integration: stellarService.ts, sorobanEventListener.ts.
• Security & Infrastructure: apiKeyMiddleware.ts, socket.ts, webhook.ts.

---

✅ Verification Implementation

Professional Log Format (JSON)

{"level":"info","message":"🌊 Backend running on port 3000","service":"stellarflow-backend","timestamp":"2026-03-29T07:57:40.534Z"}
# PR: Setup Winston/Morgan Logging (#35)

## 📋 Summary
Standardized the backend logging infrastructure by migrating from raw `console` calls to a centralized, structured logging system using **Winston** and **Morgan**.

---

## 🚀 Proposed Changes

### 1. 🏗️ Infrastructure Setup
- Added `winston` for professional, file-based structured logging.
- Integrated `morgan` for automated HTTP request logging.
- Configured log rotation and persistence in the `logs/` directory.

### 2. 🧹 Codebase Migration
Replaced over 50+ instances of `console.log`, `console.error`, and `console.warn` with:
- `logger.info()`: General application flow.
- `logger.error()`: Internal errors and transaction failures.
- `logger.warn()`: Performance alerts and fallback triggers.

### 3. 🛡️ Affected Services
- **Market Rates**: [marketRateService.ts](cci:7://file:///c:/BACKUP/former/Hackathon/stellar-flow-backend/stellarflow-backend/src/services/marketRate/marketRateService.ts:0:0-0:0), `KES/GHS/NGN` fetchers.
- **Stellar Integration**: [stellarService.ts](cci:7://file:///c:/BACKUP/former/Hackathon/stellar-flow-backend/stellarflow-backend/src/services/stellarService.ts:0:0-0:0), `sorobanEventListener.ts`.
- **Security & Infrastructure**: `apiKeyMiddleware.ts`, `socket.ts`, [webhook.ts](cci:7://file:///c:/BACKUP/former/Hackathon/stellar-flow-backend/stellarflow-backend/src/services/webhook.ts:0:0-0:0).

---

## ✅ Verification Implementation

### Professional Log Format (JSON)
```json
{"level":"info","message":"🌊 Backend running on port 3000","service":"stellarflow-backend","timestamp":"2026-03-29T07:57:40.534Z"}

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Hey @gidadoabdullateef5! 👋 It looks like this PR isn't linked to any issue.

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Issue	Title
#35	[Chore] Setup Winston/Morgan Logging	Link to this issue

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[gidadoabdullateef5]

I just resolved the complete. Kindly review, so the issue can be closed

[gidadoabdullateef5]

Just resolved a merge conflict, kindly review, so the issue can be closed