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/renderer/src/i18n/locales/en-US/settings.ts

@@ -742,7 +742,7 @@ export const settings = {
       incompatibleImageProtocol:
         'Incompatible (image generation protocol is unsupported)',
       incompatibleHarnessProtocol:
-        'Incompatible (requires Chat Completions, an API key, and a secure endpoint)',
+        'Incompatible (requires Chat Completions, an API key, and an HTTP/HTTPS endpoint)',
       secureStorageWarning:
         'Secure system key storage is unavailable. Use an environment variable to avoid storing an API Key in plaintext.'
     },

src/renderer/src/i18n/locales/zh-CN/settings.ts

@@ -681,7 +681,7 @@ export const settings = {
       incompatible: '不兼容',
       incompatibleImageProtocol: '不兼容（不支持图像生成协议）',
       incompatibleHarnessProtocol:
-        '不兼容（需 Chat Completions、API Key 和安全地址）',
+        '不兼容（需 Chat Completions、API Key 和 HTTP/HTTPS 地址）',
       secureStorageWarning:
         '当前系统密钥服务不可用。为了避免明文落盘，请使用环境变量提供 API Key。'
     },