fix(cli): stream edge runtime bootstrap (CLI-2216)

[7ttp]

TL;DR

fixes supabase start and functions serve dying with edge-runtime's "failed to determine entrypoint" on Docker daemons that cannot see the client's filesystem (remote tcp DOCKER_HOST contexts, podman machines)

• which was broken by fix(cli): shorten serve argv #5712 moving the bootstrap index.ts out of the sh -c argv onto a single file host bind mount to fix the Windows ENAMETOOLONG crash
• and feat(cli): port supabase start command to native TypeScript #5847 making native start reuse that serve core which left the bind sourcing a host path such daemons silently materialize as an empty directory at /root/index.ts

so now the bundled template is streamed into the created container with docker cp before docker start,
the same delivery Kong, Postgres, and Supavisor secret files already use since:

• fix(cli): port db start container bootstrap to native TS (CLI-1954) #6022

which fixes bring-up on non local daemons while the earlier ENAMETOOLONG
fix stays intact since nothing returns to the spawn argv and the template no longer stages on host disk at all....

ref:

• closes: supabase start: edge runtime fails with "failed to determine entrypoint" on 2.115.0 (works on 2.108.0) — main service single-file bind mount #6254

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