fix: optimize Codex relay

[dahetaoa]

1. 修复订阅计划表的数据库兼容性 (SQLite/PostgreSQL)

• 修改说明：在 SubscriptionPlan 模型中移除显式的 decimal(10,6) 标签，并在 model/main.go 的 SQLite 迁移脚本中同步改用 REAL 类型。
• 解决问题：解决了在 SQLite 环境下因不支持显式 decimal 类型导致的初始化问题。

2. 优化 Codex 渠道的中继逻辑

• 字段补全：为 instructions 字段增加默认值（空字符串），防止部分通过通用 OpenAI 协议调用的请求因缺少该字段而报错。
• 请求头优化：强制设置严格的 Content-Type: application/json 并优化 Accept 头，避免非 Codex 客户端因未携带正确参数而被 Codex 后端拒绝。

是否有破坏性更新：否

Summary by CodeRabbit

• Bug Fixes
  • Improved Codex request handling by ensuring proper instruction field formatting and standardizing HTTP headers for streaming and non-streaming responses.

[coderabbitai]

Walkthrough

The Codex adaptor is updated to ensure proper request formatting by defaulting empty instructions to an empty string and standardizing HTTP headers. Content-Type is explicitly set to application/json, and Accept header is conditionally set based on streaming mode.

Changes

Cohort / File(s)	Summary
Codex Adaptor Request Handling relay/channel/codex/adaptor.go	Updated ConvertOpenAIResponsesRequest to default empty content to empty string JSON literal for instructions field. Updated SetupRequestHeader to explicitly set Content-Type to application/json and standardize Accept header based on streaming mode.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 The adaptor hops with headers neat,
Instructions never left incomplete,
Content flows as JSON streams,
A rabbit's standardized API dreams! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	⚠️ Warning	The title 'fix: optimize Codex relay' is partially related to the changeset but does not highlight the main change. The raw_summary shows additions to ConvertOpenAIResponsesRequest and SetupRequestHeader, but the objectives reveal two distinct changes: SQLite compatibility fixes and Codex relay optimizations. The title only addresses the secondary Codex optimization aspect, not the primary SQLite subscription plan compatibility issue.	Update the title to reflect both main changes, such as 'fix: resolve SQLite compatibility and optimize Codex relay' or prioritize it based on which change is more critical.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[seefs001]

1就不必了吧，codex的可以改，可以清理一下我来merge

[Calcium-Ion]

你的修改可能会导致已经安装的用户出现迁移失败，无法启动的问题

[dahetaoa]

1就不必了吧，codex的可以改，可以清理一下我来merge

已清理关于1的修改，现在仅保留对codex渠道的修复，麻烦查看下