feat: initial codebase v0.4.1

- Extract complete codebase from running staging pod
- Add Dockerfile with multi-stage build for Node.js + Puppeteer
- Configure CI/CD workflows for staging and production deployment
- Include all source files, configs, and public assets

src/routes/signup.ts

@@ -0,0 +1,29 @@
+import { Router } from "express";
+import { createKey } from "../services/keys.js";
+import logger from "../services/logger.js";
+
+export const signupRouter = Router();
+
+// Simple signup: email → instant API key (no verification for now)
+signupRouter.post("/free", async (req, res) => {
+  const { email } = req.body;
+
+  if (!email || typeof email !== "string" || !email.includes("@")) {
+    res.status(400).json({ error: "Valid email required" });
+    return;
+  }
+
+  try {
+    const key = await createKey(email.toLowerCase().trim(), "free");
+    logger.info({ email: email.slice(0, 3) + "***" }, "Free signup");
+    res.json({
+      apiKey: key.key,
+      tier: "free",
+      limit: 100,
+      message: "Your API key is ready! 100 free screenshots/month.",
+    });
+  } catch (err: any) {
+    logger.error({ err }, "Signup failed");
+    res.status(500).json({ error: "Signup failed" });
+  }
+});