Fetch Real Weather Data on WearOS

[singhaditya21]

Implemented real weather data fetching for the Wear OS module.
This replaces the static demo data in WeatherScreen with live data from the Open-Meteo API.
The implementation includes:

• WearWeatherRepository: A repository that manages weather data fetching and caching.
• OpenMeteoApi: Interface for Open-Meteo weather API.
• NominatimApi: Interface for Nominatim reverse geocoding API to get location names.
• OpenMeteoModels: Data classes for API responses and a WeatherCodeMapper for condition strings and icons.
• Updated WeatherScreen.kt to call the repository inside a LaunchedEffect.

The implementation defaults to San Francisco coordinates if no location is provided, but is extensible to support real location updates in the future.
Includes User-Agent header for Nominatim requests as per their usage policy.

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PR created automatically by Jules for task 15801466544280745067 started by @singhaditya21

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[singhaditya21]

Leaving this open rather than merging, for two reasons worth recording.

The Android app cannot currently be built. android/gradle/wrapper/gradle-wrapper.jar is absent from the repo — not gitignored, just never committed — so ./gradlew fails from a fresh clone. Until that is regenerated (cd android && gradle wrapper --gradle-version 8.13) there is no way to compile or test this change, and CI has no Android job either. Merging unverifiable platform code into main is not worth the risk while the backend work is landing there.

Everything else in this triage pass was either applied to main with tests or closed with a reason; these Android PRs are the one group blocked on tooling rather than on review.