Implement website security features to prevent code viewing and saving

Adds meta tags for SEO and bot control, and JavaScript to disable right-click, Ctrl+U, Ctrl+S, and F12 across multiple HTML and PHP files.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: bd614ffa-c552-4a6b-b860-b6c404eb2740
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 884fa28d-58d8-4984-9afe-729ad835f951
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/22cffef4-a606-446b-8ce3-11995dcb036b/bd614ffa-c552-4a6b-b860-b6c404eb2740/py9RVof
