feat(v2/registry): register ollama-cloud as a first-class provider

Ollama Cloud now appears in Providers() alongside local Ollama, with its
own EnvKey (OLLAMA_API_KEY) and a curated cloud-model list for picker UIs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

v2/registry.go

@@ -135,6 +135,22 @@ var providerRegistry = []ProviderInfo{
 		},
 		New: func(_ string, opts ...ClientOption) *Client { return Ollama(opts...) },
 	},
+	{
+		Name:        "ollama-cloud",
+		DisplayName: "Ollama Cloud",
+		EnvKey:      "OLLAMA_API_KEY",
+		DefaultURL:  ollama.DefaultCloudBaseURL,
+		Models: []string{
+			"ministral-3:14b",
+			"kimi-k2.5", "kimi-k2.6",
+			"qwen3.5:122b",
+			"gemma4:31b",
+			"deepseek-v4-flash", "deepseek-v4-pro",
+			"glm-5.1",
+			"gemini-3-flash-preview",
+		},
+		New: OllamaCloud,
+	},
 }
 
 // Providers returns a copy of the registered provider list so callers cannot