feat: expose Smart sticky sessions

[eyaeya]

Dependency chain

This PR is part of a three-PR change set for Smart strategy: sticky-sessions support:

1. OIX core support: vernesong/mihomo-oix#6
2. Matching non-OIX core support: vernesong/mihomo#10
3. OpenClash LuCI/YAML wiring, this PR: vernesong/OpenClash#5198

This OpenClash PR depends on compatible core support. It only exposes and writes strategy: sticky-sessions; the actual affinity behavior must be implemented by the selected core.

Compatibility dependency by selected core:

• OIX users need vernesong/mihomo-oix#6, or an equivalent OIX core release, before enabling this option.
• Non-OIX users need vernesong/mihomo#10, or an equivalent non-OIX core release, before enabling this option.

Recommended merge/release order:

1. Merge/release core support: vernesong/mihomo-oix#6 and vernesong/mihomo#10.
2. Merge this OpenClash PR after supported cores can parse and enforce Smart strategy: sticky-sessions.

On older cores, generated YAML containing Smart strategy may fail config parsing. That is why this PR keeps the option opt-in, leaves defaults unchanged, and includes LuCI wording that calls out the core dependency.

Summary

Expose Smart strategy: sticky-sessions in OpenClash without changing existing defaults.

This PR only wires configuration and LuCI. The actual sticky behavior must be provided by a compatible Smart-capable core.

Root cause

Router-side investigation found that OpenClash had partial Smart strategy plumbing but no working end-to-end path:

• yml_groups_get.sh could import a Smart YAML strategy into UCI as strategy_smart.
• yml_groups_set.sh did not read or write strategy_smart, so exporting/regenerating YAML dropped it.
• LuCI exposed strategy only for load-balance, not Smart.
• Smart auto-switch converted url-test/load-balance groups to smart and added LightGBM/collect/prefer-ASN fields, but never wrote a Smart strategy.
• Current cores before the paired core PRs do not parse Smart strategy, so OpenClash must not present this as an OpenClash-only fix.

Design

• Add per-group strategy_smart LuCI option for Smart groups.
• Only offer sticky-sessions for Smart groups; do not offer round-robin or consistent-hashing because those remain load-balance strategies.
• Read strategy_smart in yml_groups_set.sh and write strategy: sticky-sessions only when explicitly set.
• Add global smart_strategy, defaulting to 0, for Smart auto-switch/overwrite flows.
• Pass smart_strategy into yml_rules_change.sh and only write group['strategy'] = 'sticky-sessions' when the user explicitly selects it.
• Keep default behavior unchanged: no Smart group receives strategy unless explicitly configured.
• Restrict global smart_strategy to groups newly converted by Smart auto-switch; existing Smart groups continue to use their per-group strategy_smart setting.
• Add a small offline regression script checking the critical wiring paths.

Validation

• bash -n luci-app-openclash/root/usr/share/openclash/*.sh luci-app-openclash/root/etc/init.d/openclash tests/openclash_smart_strategy_test.sh
• tests/openclash_smart_strategy_test.sh
• git diff --check HEAD^ HEAD

[Pluviophile714]

用ai用魔怔了？

[eyaeya]

用ai用魔怔了？

@Pluviophile714
如果是 PR 质量问题，请明确指出。
如果是情绪问题，那么，烦请大佬你出手解决 Smart 模式下 strategy: sticky-sessions 失效的问题，例如短时间内 chatgpt.com:443：170 条连接命中过 9 个节点。我会认真阅读大佬你的PR。

[eyaeya]

2026-07-02 最新核验

结论：暂不关闭。当前 upstream 只已有 load-balance 侧的 strategy 选项；尚未覆盖 Smart sticky-sessions 的 OpenClash YAML/LuCI wiring。

核验基准：OpenClash dev = c460dcf（0.47.113，2026-07-01 05:54 +0800）；OIX Alpha/Pre-Alpha = 2b1742db8a2e38dc49329133a11576804b468a6b。mihomo-oix 当前没有 GitHub Release 对象。

证据：

• git cherry -v origin/dev pr/5198 中 37953a2 仍为 +。
• origin/dev:yml_groups_set.sh 和 origin/dev:yml_rules_change.sh 没有 strategy_smart 或 smart_strategy 写入链路。
• origin/dev:config-overwrite.lua 没有全局 smart_strategy 设置；origin/dev:root/etc/config/openclash 也没有默认配置项。
• OIX origin/Alpha:adapter/outboundgroup/smart.go 没有 SmartOption.Strategy、stickyCache 或 sticky-sessions 解析/执行；core 侧配套仍在 feat: add Smart sticky sessions mihomo-oix#6。

收益差异：upstream 当前收益是保留已有 load-balance strategy 和 Smart 基础开关；本 PR 额外把 Smart 组的 strategy: sticky-sessions 作为显式 opt-in 从 LuCI/UCI 写到 YAML，并让 Smart auto-switch 流程能按用户选择写入该策略。默认不改变现有行为，等兼容 core 支持后可提供应用/域名层面的 Smart 会话亲和能力。

因此本 PR 仍有独立收益，保留开放，并继续依赖 OIX #6 / 非 OIX core 等价实现。

[eyaeya]

2026-07-04 Code Review 修复说明

本轮重新基于当前 origin/dev 审查了该 PR，并发现 Smart sticky-sessions 暴露后有两个联动问题，已追加修复 commit 0931d0e：

1. 全局 smart_strategy=sticky-sessions 在 LuCI 中可独立配置，但此前只对 auto smart switch 转换出来的组写入 strategy，已有 type: smart 的组不会生效。
2. auto smart switch 将 load-balance 转为 smart 时会保留原 YAML 的 strategy: consistent-hashing 等旧策略；配合 mihomo Smart sticky-sessions 解析逻辑时，非空且非 sticky-sessions 的 Smart strategy 会导致 core 拒绝配置。

修复内容：

• 转换 url-test/load-balance 为 smart 时先清理旧 strategy。
• 当全局 smart_strategy=sticky-sessions 且组类型为 smart 时统一写入 strategy: sticky-sessions，覆盖已有 Smart 组和转换后的 Smart 组。
• 补充 tests/openclash_smart_strategy_test.sh 覆盖默认转换不保留 legacy strategy、全局 sticky 作用于已有 Smart 组、非 Smart 组不被写入 strategy。

验证：

• bash -n luci-app-openclash/root/usr/share/openclash/yml_rules_change.sh luci-app-openclash/root/usr/share/openclash/yml_groups_set.sh tests/openclash_smart_strategy_test.sh
• bash tests/openclash_smart_strategy_test.sh
• git diff --check
• 对抗式复审未发现新的需要修正问题。

[eyaeya]

2026-07-08 最新核验与范围更新

结论：不关闭。本 PR 的 Smart sticky-sessions 目标只被最新 dev 部分覆盖，剩余 LuCI/UCI/YAML 写入链路仍未进入上游。

核验结果：

• 最新 dev 已到 0e05592d313d46dca69240aa4a7e5fb2d67625a2。
• upstream 已有部分前置能力：yml_groups_get.sh 能把 Smart YAML strategy 导入到 strategy_smart，groups-config.lua 的 load-balance strategy 列表也已有 sticky-sessions。
• upstream 仍缺 Smart 专用 strategy_smart UI、全局 smart_strategy 开关/default/init 传参、yml_groups_set.sh 导出 Smart strategy: sticky-sessions，以及 yml_rules_change.sh 在 auto smart switch/全局 sticky 场景下的写入逻辑。

执行计划与本次更新：

1. 基于最新 origin/dev 重新合并 PR 分支，保留 upstream 已经覆盖的 yml_groups_get.sh 导入逻辑，不重复实现。
2. 保留本 PR 仍缺失的 wiring：Smart group strategy_smart UI、导出 YAML、全局 smart_strategy UI/default/init 参数和 yml_rules_change.sh 写入链路。
3. 保留安全边界：load-balance 原 strategy 仍只作用于 load-balance；auto smart switch 转换为 smart 时清理旧的 load-balance strategy；全局 sticky 只写入 type: smart 的组。
4. 用聚焦测试覆盖静态 wiring、legacy strategy 清理、全局 sticky 作用范围和导入/导出 round-trip。

已推送：

• 合入最新 dev：0e05592d313d46dca69240aa4a7e5fb2d67625a2
• 新 head：db716245f19d645adf79fdc33537bda379399d56
• 当前 PR 状态读回：MERGEABLE / CLEAN，没有 merge conflict。

验证：

bash tests/openclash_smart_strategy_test.sh
bash -n luci-app-openclash/root/usr/share/openclash/*.sh
bash -n tests/*.sh
sh -n luci-app-openclash/root/etc/init.d/openclash
git diff --check
rg -n '^(<<<<<<<|=======|>>>>>>>)'

以上均已通过。另做了一轮只读复核，确认最终 diff 未重新引入 upstream 已覆盖的 yml_groups_get.sh 逻辑，且仍只聚焦 Smart sticky wiring。