fix: prefer clowder config over env for postgresql vars

[jdobes]

helps in environments with many conflicting env variables that would break the application otherwise

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Secure Coding Checklist

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Summary by Sourcery

Bug Fixes:

• Ensure PostgreSQL connection settings consistently use Clowder database configuration values instead of potentially conflicting environment variables.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The configuration path now exclusively uses Clowder-provided PostgreSQL settings instead of allowing POSTGRES_* environment variables to override them, preventing conflicting environment values from breaking the application.

File-Level Changes

Change	Details	Files
Make Clowder database configuration authoritative over PostgreSQL environment variables.	Read database name, username, password, hostname, and port directly from the Clowder configuration. Continue converting the configured port to an integer while preserving SSL mode and RDS certificate handling.	common/config.py

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