[Feature Request] Expose public WebSocket proxy/connect options on ws.Client

Lee lark_oapi/ws/client.py alrededor de _ws_connect_kwargs() y la llamada a websockets.connect(), y luego sigue cómo obtienen sus argumentos las conexiones iniciales y las reconexiones. Define la configuración pública del proxy por Client para los comportamientos de valor predeterminado solicitado, entorno, deshabilitado y proxy explícito, y verifica que ambas rutas de conexión usen la misma política sin depender del helper a nivel de módulo.

English

Problem

lark.ws.Client currently forces a direct WebSocket connection on websockets 15 by returning {"proxy": None} from the private module-level helper _ws_connect_kwargs():

https://github.com/larksuite/oapi-sdk-python/blob/dcec8e409b46a7830d33584e3690e7719e7a992a/lark_oapi/ws/client.py#L73-L80

The result is passed to websockets.connect() here:

https://github.com/larksuite/oapi-sdk-python/blob/dcec8e409b46a7830d33584e3690e7719e7a992a/lark_oapi/ws/client.py#L193-L205

This preserves the SDK's historical direct-connect behavior, but applications whose outbound traffic must use an HTTP/HTTPS/SOCKS proxy have no supported way to let the event WebSocket honor HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, and NO_PROXY.

This is specifically about the long-lived event WebSocket. It is separate from HTTP API proxy support discussed in #82.

Current workaround

Applications must monkeypatch the private global helper:

import lark_oapi.ws.client as ws_client

# Let websockets 15 use its normal environment proxy discovery.
ws_client._ws_connect_kwargs = lambda: {}

One real-world adapter is here:

https://github.com/ZichaoLong/focus/blob/main/bot/feishu_ws_proxy.py

This workaround is fragile across SDK updates and process-global, so it cannot safely configure different Client instances independently.

Requested public API

Please expose a supported, per-Client way to configure the arguments or proxy policy used by websockets.connect().

Possible API shapes include:

lark.ws.Client(..., ws_proxy="env")       # honor proxy environment variables
lark.ws.Client(..., ws_proxy="disabled")  # force a direct connection

or:

lark.ws.Client(..., ws_connect_kwargs={"proxy": True})

The exact API shape is up to the maintainers. The important properties are:

• The existing default remains unchanged for backward compatibility.
• Configuration is per client instance, not a module-level global.
• The same policy is used for initial connection and reconnects.
• Environment proxy discovery, explicit proxy disabling, and ideally an explicit proxy URL can be represented.
• Callers no longer need to depend on _ws_connect_kwargs.

Environment

• Latest PyPI release observed: lark-oapi 1.7.1
• Also reproduced with: lark-oapi 1.6.4
• websockets 15.x

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中文

问题

lark.ws.Client 当前会通过私有的模块级函数 _ws_connect_kwargs() 返回 {"proxy": None}，从而在 websockets 15 下强制 WebSocket 直连：

https://github.com/larksuite/oapi-sdk-python/blob/dcec8e409b46a7830d33584e3690e7719e7a992a/lark_oapi/ws/client.py#L73-L80

返回值随后在这里传给 websockets.connect()：

https://github.com/larksuite/oapi-sdk-python/blob/dcec8e409b46a7830d33584e3690e7719e7a992a/lark_oapi/ws/client.py#L193-L205

这一行为保留了 SDK 历史上的默认直连语义，但如果应用的出站网络必须经过 HTTP、HTTPS 或 SOCKS 代理，目前没有公开且受支持的方式，让事件 WebSocket 遵从 HTTP_PROXY、HTTPS_PROXY、ALL_PROXY 和 NO_PROXY。

本 issue 只讨论长连接事件 WebSocket，与 #82 中的 HTTP API 代理支持是两个不同问题。

当前 workaround

应用目前只能 monkeypatch 私有的全局函数：

import lark_oapi.ws.client as ws_client

# 让 websockets 15 使用正常的环境变量代理发现行为。
ws_client._ws_connect_kwargs = lambda: {}

一个实际使用中的适配实现见：

https://github.com/ZichaoLong/focus/blob/main/bot/feishu_ws_proxy.py

这种方式依赖 SDK 私有实现，升级时容易失效；而且修改的是进程级全局状态，无法安全地为不同 Client 实例设置不同代理策略。

希望提供的公开接口

希望 Client 提供一个受支持、按实例生效的公开接口，用于配置传给 websockets.connect() 的参数或代理策略。

可能的接口形式例如：

lark.ws.Client(..., ws_proxy="env")       # 遵从代理环境变量
lark.ws.Client(..., ws_proxy="disabled")  # 强制直连

或者：

lark.ws.Client(..., ws_connect_kwargs={"proxy": True})

具体 API 形式由维护者决定。希望它至少满足：

• 默认行为保持不变，避免破坏现有调用方。
• 配置属于单个 Client 实例，而不是模块级全局状态。
• 首次连接和后续重连使用相同策略。
• 能表达环境变量代理发现、显式禁用代理，最好也支持显式代理 URL。
• 调用方不再需要依赖私有的 _ws_connect_kwargs。

环境

• 当前观察到的 PyPI 最新版本：lark-oapi 1.7.1
• 同样复现于：lark-oapi 1.6.4
• websockets 15.x