Reduce settings log noise

[NaitikRishu]

Summary

This PR removes noisy startup logging from Django settings and makes SQL query logging opt-in in debug mode.

Problem

While running locally, settings were printing runtime config values at startup (including DB/Redis-related values), and SQL query logging was always enabled when DEBUG=True, which created excessive log noise.

Changes

• Removed raw print(...) calls from myapp/settings.py
• Added LOG_SQL_DEBUG env var (default False)
• SQL query logging (django.db.backends) now only enables when:
  • DEBUG=True
  • LOG_SQL_DEBUG=True
• Updated env documentation:
  • .env.example
  • docs/ENV_TEMPLATE.md

Why

• Avoids exposing runtime config values in logs
• Keeps local logs cleaner by default
• Still allows SQL-level debugging when explicitly needed

Validation

• poetry run python manage.py check passed
• poetry run python manage.py migrate --noinput passed

[NaitikRishu]

Issue observed during local setup: settings printed runtime config values and always enabled SQL query logs in debug mode, which made logs noisy and harder to use. This PR removes the prints and introduces LOG_SQL_DEBUG so SQL logging is explicit and opt-in.