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/agents/test_video_analyzer_universal.py

@@ -50,9 +50,9 @@ def test_video_analyzer_universal_engine_detection(mock_context):
     """Test that VideoAnalyzer routes to Universal Engine when non-Gemini model is set."""
     from artemis.config import settings
 
-    with patch.object(settings, "GOOGLE_API_KEY", None):
+    with patch.object(settings, "OPENAI_API_KEY", None):
         agent = VideoAnalyzer(mock_context)
-        assert agent.use_native_gemini is False
+        assert not hasattr(agent, "_ensure_genai_client")
         assert agent.model_name == "claude-3-7-sonnet"