fix: Use pybun instead of bun for SSR command

[patrick91]

Summary

• Use sys.executable -m pybun for the SSR command instead of bun directly
• Add pybun>=1.0.0 as a dependency
• Fixes production crash where bun is not on PATH (exit code 127)

Context

The zero-config SSR feature added in #48 hardcoded bun as the SSR command, but production Python environments (e.g. Docker) don't have bun installed globally. pybun is a Python package that bundles the bun binary, so using sys.executable -m pybun ensures it works wherever the Python app runs.

Test plan

• Deploy to production and verify SSR works without bun on PATH
• Verify view-source shows pre-rendered HTML

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/use-pybun-for-ssr

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