feat: add Chinese UI, Responses models, and mirrored Windows setup

Localize the web console and persist custom model and capability settings.
Use OpenAI Responses exclusively and move runtime limits into environment configuration.
Bootstrap uv and the virtual environment on Windows, support optional China mirrors,
and package source distributions without environments, build output, or credentials.

Update regression tests and repository quality checks for the new behavior.

tests/unit/test_credentials_validator.py

@@ -34,38 +34,42 @@ def test_extract_error_message():
 
 @pytest.mark.asyncio
 async def test_validate_empty_and_placeholder():
-    is_valid, msg = await validate_api_key("google", "")
+    is_valid, msg = await validate_api_key("openai", "")
     assert not is_valid
     assert "empty" in msg.lower()
 
-    is_valid, msg = await validate_api_key("google", "API_KEY")
+    is_valid, msg = await validate_api_key("openai", "API_KEY")
     assert not is_valid
     assert "placeholder" in msg.lower()
 
 
 @pytest.mark.asyncio
-async def test_validate_gemini_success():
-    with patch("httpx.AsyncClient.get", new_callable=AsyncMock) as mock_get:
+async def test_validate_responses_success():
+    with patch("httpx.AsyncClient.post", new_callable=AsyncMock) as mock_get:
         mock_resp = MagicMock()
         mock_resp.status_code = 200
+        mock_resp.json.return_value = {"output": [{"type": "message"}]}
         mock_get.return_value = mock_resp
 
-        is_valid, msg = await validate_api_key("google", "valid_key_12345")
+        is_valid, msg = await validate_api_key("openai", "valid_key_12345")
         assert is_valid
-        assert "verified successfully" in msg
+        assert "验证成功" in msg
+        assert mock_get.call_args.args[0].endswith("/responses")
+        assert mock_get.call_args.kwargs["json"]["store"] is False
 
 
 @pytest.mark.asyncio
-async def test_validate_gemini_failure():
-    with patch("httpx.AsyncClient.get", new_callable=AsyncMock) as mock_get:
+async def test_validate_responses_failure():
+    with patch("httpx.AsyncClient.post", new_callable=AsyncMock) as mock_get:
         mock_resp = MagicMock()
         mock_resp.status_code = 400
         mock_resp.json.return_value = {"error": {"message": "API key not valid."}}
         mock_get.return_value = mock_resp
 
-        is_valid, msg = await validate_api_key("google", "bad_key_12345")
+        is_valid, msg = await validate_api_key("openai", "bad_key_12345")
         assert not is_valid
-        assert "API key not valid" in msg
+        assert "HTTP 400" in msg
+        assert "bad_key" not in msg
 
 
 @pytest.mark.asyncio