fix: allow HTTP for configurable service endpoints

DeepSeek Harness and Weixin binding configuration rejected non-loopback HTTP endpoints even when users explicitly selected those internal services. Configurable endpoints now accept valid HTTP and HTTPS URLs without host-location restrictions, while retaining the required protocol and API-key checks.

Release note: 模型连接、DeepSeek Harness 与微信绑定现在可直接使用局域网或公网 HTTP/HTTPS 服务地址，不再强制公网 HTTPS 或本机回环地址。

src/main/deepseek-harness-host.ts

@@ -93,7 +93,7 @@ function validateHostConfig(
     !isDeepSeekHarnessCompatibleBaseUrl(config.baseUrl)
   ) {
     throw new Error(
-      'Controlled Harness requires a secure OpenAI-compatible Chat Completions endpoint'
+      'Controlled Harness requires an HTTP or HTTPS OpenAI-compatible Chat Completions endpoint'
     )
   }
   if (!config.credentialRefs.length) {