feat: add webhook-first app router with wallet, job, and unlock endpoints

src/config.js

@@ -0,0 +1,28 @@
+"use strict";
+
+function intFromEnv(name, fallback) {
+  const raw = process.env[name];
+  if (!raw) {
+    return fallback;
+  }
+
+  const parsed = Number.parseInt(raw, 10);
+  return Number.isInteger(parsed) ? parsed : fallback;
+}
+
+const config = {
+  port: intFromEnv("PORT", 3000),
+  xWebhookSecret: process.env.X_WEBHOOK_SECRET || "dev-x-secret",
+  polarWebhookSecret: process.env.POLAR_WEBHOOK_SECRET || "dev-polar-secret",
+  credit: {
+    baseCredits: intFromEnv("BASE_CREDITS", 1),
+    includedChars: intFromEnv("INCLUDED_CHARS", 25000),
+    stepChars: intFromEnv("STEP_CHARS", 10000),
+    stepCredits: intFromEnv("STEP_CREDITS", 1),
+    maxCharsPerArticle: intFromEnv("MAX_CHARS_PER_ARTICLE", 120000),
+  },
+};
+
+module.exports = {
+  config,
+};