Add test utilities for generating mock IoT data

[AbelOsaretin]

What

No reusable helpers exist for creating mock solar and satellite data in tests.

Why

Test files duplicate mock data creation. A shared utility ensures consistency and reduces boilerplate.

Scope

• Create helper functions: createMockSolarData(), createMockSatelliteData()
• Accept optional overrides for specific fields
• Return valid data structures matching the interface

Acceptance Criteria

• createMockSolarData(overrides?) returns valid solar data
• createMockSatelliteData(overrides?) returns valid satellite data
• Default values are realistic
• Overrides work for any field

Technical Context

• src/routes/iot.ts:11-22 — getSolarData return shape
• src/routes/iot.ts:24-33 — getSatelliteData return shape
• Tests currently inline mock data

[webdevayo]

@webdevayo has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I will love to work on this. please assign.

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[Dannybraize]

@Dannybraize has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hellp maintainer, please assign this to me

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[LawalRahman]

@LawalRahman has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi! I'd love to contribute to this project. I have experience building and maintaining production applications and enjoy working on well-scoped tasks. I focus on writing clean, maintainable code, communicating clearly, and delivering quality work on time. I'm excited about the opportunity to contribute and collaborate with the team.

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This issue has been completed by @LawalRahman as part of the Stellar Wave Program's 7th Wave 🥳

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