Enforce SCRAM-SHA-256 DB Auth and Configurable LAN Networking

[tyronechrisharris]

This submission enhances the security of the OSCAR system by implementing robust database authentication and flexible networking.

Key changes include:

1. SCRAM-SHA-256 Enforcement: Updated the PostGIS Docker configuration to use SCRAM-SHA-256 authentication during initialization.
2. Docker Secrets Integration: All launch and run scripts now generate a secure, random database password (stored in .db_password) and inject it into the container via POSTGRES_PASSWORD_FILE. The OSH Java backend has been modified to prioritize reading credentials from this secret file at runtime.
3. Configurable LAN Networking: Added support for the DB_HOST environment variable across all launch scripts and the backend logic, allowing the database to be hosted on a separate machine on the same LAN.
4. Secure Connectivity: The OSH backend now enforces TLS for all PostGIS connections by default (ssl=true).
5. Cross-Platform Utilities: Created backup.sh/bat and restore.sh/bat in the repository root for safe and easy database maintenance, respecting the new security and networking configurations.
6. Credential Sanitization: Removed all instances of the hardcoded "postgres" password from configuration files and scripts.

These changes were implemented while maintaining full compatibility with the OpenSensorHub framework and OSH persistence modules.

Fixes #28

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🔄 Auto-Distributed via AI Sync

Original Flat Repo PR: tyronechrisharris/oscar-flat#39