feat: add AgriTech component for API integration

[trivedikavya]

Description:
This pr is related to #1442 in This PR introduces the AgriTechDemo component, a comprehensive integration example that connects the React frontend to the Flask-based ML backend. It demonstrates how to handle various data types including JSON for predictions and FormData for image-based disease detection.

Key Features:

• Interactive Forms: Implemented inputs for soil metrics (N, P, K) and environmental factors for Crop Recommendation.
• Image Upload Support: Added a disease detection module that handles file selection, image preview, and multipart/form-data submission.
• Yield Prediction: Integrated a geographic-based yield predictor with support for seasonal and area-based calculations.
• Robust State Management: Includes built-in loading spinners, error handling for API failures, and conditional rendering for ML results.

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[github-actions]

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[github-actions]

🎉 Congrats @trivedikavya on getting your PR merged! 🙌
Thanks for the contribution — looking forward to more from you 🚀