feat(opsce): integrate Stellar SDK for asset tokenization and impleme…

[feyishola]

…nt export features

Summary
This PR implements four major OpsCE module features enabling asset tokenization on Stellar Soroban, PDF reporting, bulk export capabilities, and QR code generation for physical asset tagging.

Changes Included

1. Stellar SDK Integration for Asset Tokenization
   Files:

backend/src/opsce/stellar/stellar.service.ts

backend/src/opsce/assets/assets.controller.ts

backend/src/opsce/assets/assets.module.ts

tests/opsce/stellar/stellar.service.test.ts

2. PDF Asset Report Generation
   Files:

backend/src/opsce/exports/pdf.service.ts

backend/src/opsce/exports/exports.controller.ts

tests/opsce/exports/pdf.service.test.ts

Endpoint: GET /api/assets/:id/report

Features:

Generates professional PDF with asset metadata

Includes maintenance history table (last 10 records)

Embeds QR code image (reuses QrService)

Multi-page support for long maintenance histories

PDF Sections:

Header: Asset name, ID, QR code

Details Table: Serial number, status, condition, purchase info

Location: Department, location, assigned user

Financial: Purchase date, purchase value, current value

Maintenance History: Date, type, description, cost, technician

3. CSV and Excel Asset Export
   Files:

backend/src/opsce/exports/exports.service.ts

backend/src/opsce/exports/exports.controller.ts

tests/opsce/exports/exports.service.test.ts

Endpoint: GET /api/assets/export?format=csv|xlsx

4. QR Code Generation for Assets
   Files:

backend/src/opsce/assets/qr.service.ts

backend/src/opsce/assets/assets.controller.ts

tests/opsce/assets/qr.service.test.ts

Endpoint: GET /api/assets/:id/qr

closes #747
closes #748
closes #749
closes #750

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