feat: Passwordless cross-device authentication

- Arkitektur: docs/auth/passwordless-architecture.md
- Backend: iom/quixzoom-auth-service/ (FastAPI + Redis)
- Webb: quixzoom-market-pages/se/login/ (QR-kod + polling)
- App: iom/quixzoom-app/src/features/auth/ (push + deep links)

Flöde: QR-kod → app-godkännande → webb-inloggad

landvex/node_modules/resolve-from/index.js

@@ -0,0 +1,47 @@
+'use strict';
+const path = require('path');
+const Module = require('module');
+const fs = require('fs');
+
+const resolveFrom = (fromDirectory, moduleId, silent) => {
+	if (typeof fromDirectory !== 'string') {
+		throw new TypeError(`Expected \`fromDir\` to be of type \`string\`, got \`${typeof fromDirectory}\``);
+	}
+
+	if (typeof moduleId !== 'string') {
+		throw new TypeError(`Expected \`moduleId\` to be of type \`string\`, got \`${typeof moduleId}\``);
+	}
+
+	try {
+		fromDirectory = fs.realpathSync(fromDirectory);
+	} catch (error) {
+		if (error.code === 'ENOENT') {
+			fromDirectory = path.resolve(fromDirectory);
+		} else if (silent) {
+			return;
+		} else {
+			throw error;
+		}
+	}
+
+	const fromFile = path.join(fromDirectory, 'noop.js');
+
+	const resolveFileName = () => Module._resolveFilename(moduleId, {
+		id: fromFile,
+		filename: fromFile,
+		paths: Module._nodeModulePaths(fromDirectory)
+	});
+
+	if (silent) {
+		try {
+			return resolveFileName();
+		} catch (error) {
+			return;
+		}
+	}
+
+	return resolveFileName();
+};
+
+module.exports = (fromDirectory, moduleId) => resolveFrom(fromDirectory, moduleId);
+module.exports.silent = (fromDirectory, moduleId) => resolveFrom(fromDirectory, moduleId, true);