feat: add AI settings controls

src/lib/ai-feature-flags.ts

@@ -0,0 +1,32 @@
+const ENABLED_VALUES = new Set(["1", "true", "yes", "on"]);
+const DISABLED_VALUES = new Set(["0", "false", "no", "off"]);
+
+const normalizeFlagValue = (value?: string) => value?.trim().toLowerCase();
+
+export const isAiFlagEnabled = (value?: string): boolean => {
+	const normalizedValue = normalizeFlagValue(value);
+	if (!normalizedValue) {
+		return true;
+	}
+
+	if (ENABLED_VALUES.has(normalizedValue)) {
+		return true;
+	}
+
+	if (DISABLED_VALUES.has(normalizedValue)) {
+		return false;
+	}
+
+	return true;
+};
+
+export const isAdminAiEnabled = (
+	env: Record<string, string | undefined> = process.env,
+) => isAiFlagEnabled(env.AI_ENABLED);
+
+export const isClientAiEnabled = (
+	env: Record<string, string | undefined> = process.env,
+) => isAiFlagEnabled(env.NEXT_PUBLIC_AI_ENABLED ?? env.AI_ENABLED);
+
+export const getAiDisabledMessage = () =>
+	"AI integrations are currently disabled by the administrator.";