Problem

astro dev start --standalone calls uv venv on every restart without the --allow-existing flag. This causes uv to wipe all installed packages in the virtual environment before each run, forcing a full reinstall of ~124 packages from the CDN on every restart.

This is:

• Slow in normal environments (full CDN download on every start)
• Broken in dev containers with restricted network access, where the reinstall hangs indefinitely

Fix

Add --allow-existing to the uv venv invocation in airflow/standalone.go.

With this flag, uv venv reuses the existing virtual environment and its installed packages. The subsequent uv pip install step still always runs, so any changes to requirements.txt are picked up — it just audits the existing packages (~80ms) rather than reinstalling everything from scratch.

Changes

• airflow/standalone.go: Add --allow-existing flag to uv venv command

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