Security/config validator

[DebasmitaBose0]

Closes #254

Summary

This PR implements a robust configuration validation scanner that executes automatically when starting the backend FastAPI server, warning developers of missing configurations while keeping sensitive data securely masked.

Changes Made

• Created config_validator.py which maps required settings (SUPABASE_URL, ADMIN_TOKEN, etc.), validates their presence, and prints a neat terminal diagnostic summary.
• Integrated validate_environment() into Server/main.py to run automatically upon application startup.
• Included secure masking to ensure token/secret contents are never exposed in log outputs.

Testing

• Ran backend startup locally under multiple states (fully configured, partially configured). Verified warnings print cleanly without crashing the local fallback modes.

Impact

Provides instant and safe debugging help for local developers setting up their server backend.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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