Captain V2 assistants can now persist a configurable inactivity timer
and choose whether inactivity resolution sends the saved closing message
or resolves silently. This PR contains only the API, persistence,
runtime behavior, and backend specs.
## Closes
[AI-163](https://linear.app/chatwoot/issue/AI-163)
## Depends on
Stack 2 of 5. Based on the assistant-policy foundation in #15299. The
frontend follows in #15308.
## What changed
- Added per-assistant inactivity duration and resolution-message
settings with safe defaults.
- Restricted the Part 2 settings API to Captain V2 while keeping the
Part 1 policy mode available without V2.
- Updated inactivity handling to use the assistant timer and skip the
public resolution message when disabled.
- Serialized the effective timer and message settings for the frontend.
- Added model, request, and job coverage, including the explicit Captain
V2 boundary.
## How to test
1. Enable Captain V2 and update `auto_resolve_after` and
`send_inactivity_resolution_message` through the assistant API.
2. Run the inactivity job and confirm it uses the assistant timer.
3. Disable the resolution message and confirm the conversation resolves
silently.
4. Disable Captain V2 and confirm timer/message updates are ignored
while `auto_resolve_mode` remains updateable.
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Co-authored-by: Sony Mathew <sony@chatwoot.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
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