Co-authored-by: tbphp <tangb7420@gmail.com>

变更说明：
（1）对齐上游 tbphp 提交 feat: Optimize add key support for more strings (tbphp#347)，同步调整批量添加、恢复、删除 key 时使用的解析与校验行为。
（2）更新 utils.DelimitersPattern，移除 '|' 作为分隔符，避免包含管道符的 key 被错误拆分，提升对更丰富字符串格式的兼容性。
（3）放宽 KeyService.isValidKeyFormat 校验逻辑，仅要求去除空白后非空，不再限制具体字符集，从而支持更多样的 key 字符串形式。

变更说明：
（1）发布流程：在 Linux / macOS / Windows 三个 release 工作流中，通过 GO_VERSION 环境变量集中管理 Go 版本，统一为 1.25.x，并与 go.mod 中的 go 1.25.4 保持一致，减少后续升级时各平台配置漂移的风险。
（2）key 解析逻辑：对齐上游 tbphp 提交 feat: Optimize add key support for more strings (tbphp#347)，放宽 KeyService.isValidKeyFormat 的校验规则，只要求去除空白后非空，从而支持更宽松的上游 key 字符串格式；同时保留统一校验入口，并在函数上增加英文注释说明这一行为是有意为之，避免未来新调用点产生语义歧义。
（3）key 分隔符处理：更新 utils.DelimitersPattern 的注释，使其与当前正则实现一致，明确仅使用空白（含换行、回车、制表符）、逗号和分号作为分隔符，允许 '|' 作为 key 内容的一部分，保证在多数据库场景下批量解析文本 key 时行为稳定且无额外性能开销。

Merge upstream changes including:
- Model redirect feature (tbphp#334, tbphp#335)
- Key optimization (tbphp#371, tbphp#347)
- Add openai-response channel type support (tbphp#387)
- Upgrade dependencies and Go 1.24 documentation (tbphp#388)
- Fix key last_used_at accuracy (tbphp#383)
- Various bug fixes

Conflicts to resolve:
- models/types.go: Keep dev's LastUsedAt, ModelMappingList, Token fields
- services/subgroup_manager.go: Use dev's enhanced version
- proxy/server.go: Use dev's version (includes main's features)
- go.mod: Keep dev's dependency versions (Go 1.26)

Merge upstream changes including:
- Model redirect feature (tbphp#334, tbphp#335)
- Key optimization (tbphp#371, tbphp#347)
- Add openai-response channel type support (tbphp#387)
- Upgrade dependencies and Go 1.24 documentation (tbphp#388)
- Fix key last_used_at accuracy (tbphp#383)
- Various bug fixes

Conflicts resolved:
- models/types.go: Keep dev's LastUsedAt, ModelMappingList, Token fields
- services/subgroup_manager.go: Use dev's enhanced version
- proxy/server.go: Use dev's version (includes main's features)
- go.mod: Keep dev's dependency versions (Go 1.26)
- channel: Use upstream's openai-response naming convention for compatibility

Merge upstream changes including:
- Model redirect feature (tbphp#334, tbphp#335)
- Key optimization (tbphp#371, tbphp#347)
- Add openai-response channel type support (tbphp#387)
- Upgrade dependencies and Go 1.24 documentation (tbphp#388)
- Fix key last_used_at accuracy (tbphp#383)
- Various bug fixes

Conflicts resolved:
- models/types.go: Keep dev's LastUsedAt, ModelMappingList, Token fields
- services/subgroup_manager.go: Use dev's enhanced version
- proxy/server.go: Use dev's version (includes main's features)
- go.mod: Keep dev's dependency versions (Go 1.26)
- channel: Use upstream's openai-response naming convention for compatibility

Merge upstream changes including:
- Model redirect feature (tbphp#334, tbphp#335)
- Key optimization (tbphp#371, tbphp#347)
- Add openai-response channel type support (tbphp#387)
- Upgrade dependencies and Go 1.24 documentation (tbphp#388)
- Fix key last_used_at accuracy (tbphp#383)
- Various bug fixes

Conflicts resolved:
- models/types.go: Keep dev's LastUsedAt, ModelMappingList, Token fields
- services/subgroup_manager.go: Use dev's enhanced version
- proxy/server.go: Use dev's version (includes main's features)
- go.mod: Keep dev's dependency versions (Go 1.26)
- channel: Use upstream's openai-response naming convention for compatibility