feat(ai): Add image input tests for vision-capable models

- Added image tests to OpenAI Completions (gpt-4o-mini)
- Added image tests to Anthropic (claude-sonnet-4-0)
- Added image tests to Google (gemini-2.5-flash)
- Tests verify models can process and describe the red circle test image

packages/ai/package.json

@@ -44,6 +44,7 @@
 	},
 	"devDependencies": {
 		"@types/node": "^24.3.0",
+		"canvas": "^3.2.0",
 		"vitest": "^3.2.4"
 	}
 }