feat: add Fahrenheit temperature conversion

[marcel-tan]

Changes

Temperature Conversion

• Added convert_celsius_to_fahrenheit helper function to convert temperatures from Celsius to Fahrenheit
• Updated /api/weather-activity endpoint to return temperature in Fahrenheit instead of Celsius

Motivation

Users in regions using Fahrenheit (e.g., United States) will benefit from having temperatures displayed in their preferred unit. This change makes the weather data more accessible to these users.

Testing

• Verify /api/weather-activity returns temperature in Fahrenheit
• Verify activity recommendations still work correctly
• Test with various temperature ranges

[tusk-dev]

✔️ Tusk Drift: 5 tests completed, 1 deviation (all intended) [View results ↗]

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Note: This PR has 1 deviation. Upon merge, 1 test will be removed from the test suite (see FAQ for more details).

🟡 Intended deviations (1)

• GET /api/weather-activity

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View check history

Commit	Status	Output	✅	❌	Created (UTC)
63d78fc	Completed	Output	3	2	Jan 7, 2026 4:41AM

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