feat: add local auth billing and usage management

app/api/billing/quote/route.ts

@@ -0,0 +1,23 @@
+import { jsonError, jsonOk, readJsonBody } from "@/lib/server/api";
+import { requireAppSession } from "@/lib/server/auth/current-user";
+import { requestOrigin } from "@/lib/server/runtime";
+import { resolvePlatformUsageContext } from "@/lib/server/usage-context";
+import { quoteImageGeneration, type SubmitImageJobInput } from "@/lib/server/generation-service";
+import { quoteVideoGeneration, type SubmitVideoJobInput } from "@/lib/server/video-generation-service";
+
+export const runtime = "nodejs";
+
+export async function POST(request: Request) {
+  try {
+    const session = await requireAppSession();
+    const body = await readJsonBody<Record<string, unknown>>(request);
+    const usageContext = await resolvePlatformUsageContext(session);
+    const kind = body.kind === "video" || body.capability === "video.generate" ? "video" : "image";
+    const quote = kind === "video"
+      ? await quoteVideoGeneration({ ...body, ownerId: session.user.id, usageContext } as SubmitVideoJobInput, requestOrigin(request))
+      : await quoteImageGeneration({ ...body, capability: "image.generate", ownerId: session.user.id, usageContext } as SubmitImageJobInput, requestOrigin(request));
+    return jsonOk({ quote });
+  } catch (error) {
+    return jsonError(error, 500, { request, source: "api.billing.quote" });
+  }
+}