Add Gemini API image editing functionality with AI-powered analysis and editing instructions

[Copilot]

This PR adds comprehensive AI-powered image editing capabilities to the Base platform using Google's Gemini API. The implementation provides two main API endpoints for image analysis and editing instruction generation, along with a complete frontend interface.

New API Endpoints

/image/analyze - AI Image Analysis

Analyzes uploaded images using Gemini AI to provide detailed insights about content, composition, and characteristics:

// Upload an image for analysis
const formData = new FormData();
formData.append('image', imageFile);

const response = await fetch('/image/analyze', {
  method: 'POST',
  body: formData
});

const result = await response.json();
// Returns detailed AI analysis of the image

/image/edit - Professional Editing Instructions

Generates detailed editing instructions based on user requirements and image analysis:

// Get editing instructions
const formData = new FormData();
formData.append('image', imageFile);
formData.append('instruction', 'Make the sky more dramatic and add warm lighting');

const response = await fetch('/image/edit', {
  method: 'POST', 
  body: formData
});

const result = await response.json();
// Returns professional editing guidance and recommendations

Frontend Integration

The platform now includes a dedicated AI Image Editor accessible from the main dashboard with:

• Intuitive File Upload: Drag-and-drop interface supporting JPG, PNG, GIF, WebP (up to 10MB)
• Tabbed Interface: Separate tabs for image analysis and editing instructions
• Real-time Preview: Image preview with immediate visual feedback
• Professional UI: Modern gradient design with responsive layout

Technical Implementation

Backend Changes:

• Added Gemini AI client integration (src/utils/gemini.ts)
• Implemented secure file upload with multer
• Added comprehensive error handling and validation
• Enhanced upload service with new endpoints

Frontend Changes:

• Created dedicated ImageEditor.tsx component
• Updated main App component with navigation
• Implemented modern, responsive UI design
• Added file upload validation and preview

Dependencies Added:

• @google/generative-ai - Google Gemini AI SDK
• multer - Secure file upload handling
• @types/multer - TypeScript definitions

Configuration

Users need to add their Gemini API key to the environment:

GEMINI_API_KEY=your_gemini_api_key_here

Documentation

• Comprehensive API documentation in GEMINI_IMAGE_API.md
• Updated main README with feature overview
• Environment configuration examples
• Usage examples and setup instructions

This implementation provides a complete foundation for AI-powered image editing while maintaining all existing deployment functionality of the Base platform.

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