fix(cli): keep kong email templates

[7ttp]

TL;DR

fixes custom auth email templates silently reverting to GoTrue's built-in defaults after db reset, functions serve (every hot reload) and
branch switch kong reload re-renders nginx.conf from Kong's default template, dropping the :8088
email-templates server that only bring-up's --nginx-conf defines.
Every reload now hands that template back....

Third pass on this argument:

• PS: first complete one: fix(cli): preserve auth templates #5906 added it to functions serve's
  reload fix(cli): match Go's functions serve docker-down error, kong reload args, and secrets filtering #5976 reverted it for Go parity ("reload reuses the prefix bring-up prepared"
  it doesn't) and
• fix(cli): reload kong after db reset #6017's new db reset reload (fixing issue supabase db reset can leave Kong routing to a stale container IP, causing 502 on /auth/v1/* #6016's 502s) shipped bare on the same assumption.

Fixing Go's call sites too removes the parity argument,
so this can't be reverted on parity grounds a fourth time. #6017's DNS re-resolution is unchanged.
verified 502→200 on a rotated container IP with the new argv.
Broken stacks self-heal on the next reset.
A template-less container (only one never created by supabase start, written unconditionally since the start) now fails the reload loudly, fatal in db reset, stderr warning in functions serve/branch switch......

repro / before vs after

Real stack, kong's StartedAt never changes (container never restarted):

0. after supabase start     listeners=[8000 8001 8088 8443 8444]  template=custom ✓
1. after BASELINE db reset  listeners=[8000 8001      8443 8444]  template=REFUSED → built-in default
2. after FIXED    db reset  listeners=[8000 8001 8088 8443 8444]  template=custom ✓

• supabase db reset can leave Kong routing to a stale container IP, causing 502 on /auth/v1/* #6016 non-regression: warm 200 → rotate auth IP → 502 502 502 → new reload → 200, :8088 intact.

ref:

• closes db reset against an already-running stack leaves Kong's outbound template-serving listener (8088) permanently unbound #6059

[7ttp]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 58c8c21414

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