feat: Pass environment variables from .env file to container

[fletchgqc]

Add --env-file option to docker run command when .env file exists in the project directory. This allows environment variables defined in .env to be automatically available inside the container.

The .env file was already being mounted, but variables weren't being loaded. This simple change adds the --env-file flag to make Docker parse and load all variables from the file.

Summary by Sourcery

New Features:

• Pass environment variables from .env into the Docker container using the --env-file flag

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Enhance run_claudebox_container in lib/docker.sh to automatically load environment variables from a .env file by adding the --env-file flag to the docker run command and updating the verbose debug output accordingly.

File-Level Changes

Change	Details	Files
Automatically load environment variables from .env into the container	Append --env-file "$PROJECT_DIR/.env" to docker_args when .env exists	lib/docker.sh
Update debug logging to reflect loading of .env variables	Change verbose echo from "[DEBUG] Mounting .env file" to "[DEBUG] Mounting and loading .env file"	lib/docker.sh

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[sourcery-ai]

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