feat: Add .env loading support to NAT cli

[willkill07]

Description

We already have an indirect dependency on python-dotenv -- make it an explicit one and ensure the entrypoint loads the environment

Closes #865

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📥 Commits

Reviewing files that changed from the base of the PR and between e4e4195 and 251f9f9.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• pyproject.toml (1 hunks)
• src/nat/cli/entrypoint.py (2 hunks)

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[willkill07]

/merge