[Bug]: 今天在使用opencode go 套餐中的模型时, 一直出现 "MissingSessionID"

## QwenPaw Version

v2.2.0

## Description

在使用opencode go 套餐中的模型时, 一直提示
模型连接测试失败：API error when connecting to model 'omen-alpha' (status=400): status=400: Error code: 400 - {'type': 'error', 'error': {'type': 'MissingSessionID', 'message': 'Error from provider (Console Go): Request is missing x-opencode-session and cannot be routed efficiently. Please see https://opencode.ai/docs/go/#where-can-i-use-it'}}。

## Component(s) Affected

- [x] Core / Backend (app, agents, config, providers, utils, local_models)
- [ ] Console (frontend web UI)
- [ ] Channels (DingTalk, Feishu, QQ, Discord, iMessage, etc.)
- [ ] Skills
- [ ] CLI
- [ ] Documentation (website)
- [ ] Tests
- [ ] CI/CD
- [ ] Scripts / Deploy

## Environment

- **QwenPaw version:** v2.2.0
- **OS:** WSL Ubuntu 22.04 in Windows 11
- **Install method:** pip
- **Python version (if applicable):** 3.13

No files or tests are named in the issue body. Start by reproducing the failure in a QwenPaw v2.2.0 run (pip install, WSL Ubuntu) and reproduce the 400 `MissingSessionID` error for `omen-alpha`. Then inspect the Core/Backend areas listed by the reporter (app, agents, config, providers, utils, local_models) where Console Go request handling is likely wired. Done means the same connection test succeeds and the `MissingSessionID` response is gone.

索引モデルが issue の本文から書いたものです。