Make Django settings proxy-aware and configurable via environment variables

[pythodoc]

Motivation

• Prepare the app for Railway (or similar) deployments by allowing runtime configuration of debug, hosts, and SSL redirect settings.
• Prevent HTTPS/redirect issues when the app is served behind Railway’s TLS termination by honoring forwarded-proto headers.

Description

• Import os and make DEBUG driven by the DJANGO_DEBUG environment variable via DEBUG = os.getenv('DJANGO_DEBUG', 'False') == 'True'.
• Allow extra hosts from the DJANGO_ALLOWED_HOSTS environment variable by appending parsed values to ALLOWED_HOSTS.
• Make SECURE_SSL_REDIRECT configurable with DJANGO_SECURE_SSL_REDIRECT and add SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https') and USE_X_FORWARDED_HOST = True to support proxy/terminator setups.
• Updated paramount_holidayz/settings.py accordingly.

Testing

• No automated tests were run because this is a configuration-only change; manual validation and runtime testing on the target environment are recommended.

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[chatgpt-codex-connector]

Strip whitespace when parsing extra allowed hosts

The added parsing for DJANGO_ALLOWED_HOSTS does not trim whitespace, so a common env value like "example.com, www.example.com" yields " www.example.com" (leading space). Django treats that as a different, invalid host and will return 400 for requests to www.example.com. This only shows up when the env var includes spaces, which is typical in comma-separated lists. Consider stripping each entry before appending.

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