feat(blackbox): overhaul provider catalog + WebUI test support

- registry: baseUrl -> /v1/chat/completions, 10 latest models with
  upstreamModelId prefix, add thinkingConfig + serviceKinds
- capabilities: rename claude-opus-4.6 -> 4.8, bump claude-sonnet-4.6
  maxOutput 64k -> 128k
- testUtils: add blackbox case to testApiKeyConnection (GET /models)
- ollama: add minimax-m3 model

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/registry/ollama.js

@@ -27,6 +27,7 @@ export default {
     { id: "minimax-m2.5", name: "MiniMax M2.5" },
     { id: "glm-4.7-flash", name: "GLM 4.7 Flash" },
     { id: "qwen3.5", name: "Qwen3.5" },
+    { id: "minimax-m3", name: "MiniMax M3" },
   ],
   serviceKinds: ["llm"],
   features: {