feat(codebuddy-intl,ollama): add DeepSeek-V4.1-Flash

codebuddy-intl: deepseek-v4-flash replaced by deepseek-v4.1-flash (same
gateway catalog as CN) and a capability override so the model keeps the
openai-style reasoning_effort path instead of the vendor-native "deepseek"
thinking shape the gateway rejects. Thinking levels low/high/xhigh.

ollama: add deepseek-v4.1-flash:cloud (verified on ollama.com/api/tags) with
vision + 1M context caps.

Co-Authored-By: Claude Code <noreply@anthropic.com>

open-sse/providers/registry/ollama.js

@@ -30,6 +30,7 @@ export default {
     { id: "glm-4.7-flash", name: "GLM 4.7 Flash" },
     { id: "qwen3.5", name: "Qwen3.5" },
     { id: "minimax-m3", name: "MiniMax M3" },
+    { id: "deepseek-v4.1-flash:cloud", name: "DeepSeek V4.1 Flash" },
   ],
   serviceKinds: ["llm", "webFetch"],
   fetchConfig: {