feat: smart setup wizard - sort choices by system detection

- Editors sorted by install status + platform relevance
- Languages sorted by detected runtimes/tools on system
- AI providers sorted by platform + local ollama detection
- Added Cursor, Zed editors; Dart/Flutter, Zig languages
- Added Ollama and OpenAI as provider options
- Installed tools show "(installed)" label in editor list

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/config/config.go

@@ -156,6 +156,18 @@ func Default() *MuyueConfig {
 			Model:   "claude-sonnet-4-20250514",
 			Active:  false,
 		},
+		{
+			Name:    "openai",
+			Model:   "gpt-4o",
+			BaseURL: "https://api.openai.com/v1",
+			Active:  false,
+		},
+		{
+			Name:    "ollama",
+			Model:   "llama3",
+			BaseURL: "http://localhost:11434/api",
+			Active:  false,
+		},
 	}
 
 	cfg.BMAD.Global = true