feat: switch to Venice AI API and simplify implementation

[realestsc]

Changes

• Switched from OpenAI to Venice AI API for joke generation
• Simplified API implementation by removing streaming complexity
• Updated frontend to use direct API calls
• Added test endpoint for API verification
• Updated documentation and environment configuration

Technical Details

• Removed Vercel AI SDK dependencies
• Implemented direct HTTP requests to Venice API
• Added proper error handling
• Updated environment variables for Venice AI

Testing

• Test endpoint verified API connectivity
• Joke generation tested and working
• UI components maintained original styling

Environment Setup

• Added VENICE_API_KEY to environment variables
• Updated .gitignore to exclude environment files
• Updated README with new setup instructions

Security

• Environment variables properly handled
• API keys excluded from version control
• Added proper error handling for API failures