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/agent/create-runtime.test.ts

@@ -100,7 +100,7 @@ describe('createAgentRuntime model compatibility', () => {
         { deepseekHarnessLauncher: vi.fn() }
       )
     ).toThrow(
-      'DeepSeek Harness 需要使用 API Key 的安全 OpenAI 兼容 Chat Completions 模型连接'
+      'DeepSeek Harness 需要使用 API Key 的 OpenAI 兼容 Chat Completions 模型连接'
     )
   })