Add initial image CLI runtime

src/config.ts

@@ -0,0 +1,51 @@
+export type Config = {
+	apiKey: string;
+	baseURL: string;
+	model: string;
+};
+
+const DEFAULT_MODEL = "gemini-3.0-pro-image-landscape";
+
+function getRequiredEnv(primaryName: string, fallbackName?: string): string {
+	const primaryValue = Bun.env[primaryName]?.trim();
+
+	if (primaryValue) {
+		return primaryValue;
+	}
+
+	if (fallbackName) {
+		const fallbackValue = Bun.env[fallbackName]?.trim();
+
+		if (fallbackValue) {
+			return fallbackValue;
+		}
+	}
+
+	throw new Error(
+		`Missing required environment variable: ${primaryName}${fallbackName ? ` (or ${fallbackName})` : ""}`,
+	);
+}
+
+export function normalizeBaseUrl(baseURL: string): string {
+	const url = new URL(baseURL);
+
+	if (url.pathname === "" || url.pathname === "/") {
+		url.pathname = "/v1";
+	}
+
+	return url.toString().replace(/\/$/, "");
+}
+
+export function loadConfig(): Config {
+	return {
+		apiKey: getRequiredEnv("FLOW2API_API_KEY", "OPENAI_API_KEY"),
+		baseURL: normalizeBaseUrl(
+			getRequiredEnv("FLOW2API_BASE_URL", "OPENAI_BASE_URL"),
+		),
+		model:
+			Bun.env.FLOW2API_MODEL?.trim() ||
+			Bun.env.GEMINI_MODEL?.trim() ||
+			Bun.env.OPENAI_MODEL?.trim() ||
+			DEFAULT_MODEL,
+	};
+}