feat: Add India weather connector for FarmVibes.AI

[Nikhil Chaudhary (nik464)]

Gap fixed: FarmVibes.AI only supported US/NOAA weather data. This adds Indian coordinate support via Open-Meteo with:

• 4 major Indian crop types (wheat, rice, mustard, sugarcane)
• Crop-specific weather risk assessment
• IST timezone support
• Agri variables: ET0, radiation, precipitation

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[Renato L. de F. Cunha (renatolfc)]

Thanks for the contribution. This is not wired into FarmVibes yet: the weather file is neither packaged nor registered as an operation or workflow. The current implementation also has an off-by-one date range, incorrect timezone handling, and silently reports low risk for sugarcane and unknown crops. Please rebase onto current main, add a real op/workflow contract, correct the date and timezone behavior, reject unsupported crops explicitly, and cover those paths with focused tests.