Add a Standalone PDF Report Export Endpoint for Assets

[yusuftomilola]

Description:
pdfkit is already installed. This is a self-contained endpoint that streams a formatted PDF asset report directly to the client. It is independent of the CSV and Excel exports and can be worked on separately.

Acceptance Criteria:

• GET /api/reports/assets/export/pdf — accepts the same query filters
• Returns a PDF with Content-Disposition: attachment; filename="assets-report.pdf"
• PDF includes: report title, generated date, applied filter summary, total asset count
• Asset table with columns: Asset ID, Name, Category, Department, Status, Location
• Page numbers rendered in the footer
• Uses pdfkit streaming to pipe directly into the HTTP response
• JWT-protected

[LaGodxy]

@LaGodxy has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hello, can I take thus.

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[drips-wave]

Congratulations, @LaGodxy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @LaGodxy: 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.

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[drips-wave]

This issue has been completed by @LaGodxy as part of the Stellar Wave Program's 3rd Wave 🥳

😎 @LaGodxy: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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