docs(api): add openapi docs to auth routes

backend/routes/auth.js

@@ -0,0 +1,106 @@
+import { Router } from 'express';
+import crypto from 'crypto';
+import { registerToken } from '../middleware/auth.js';
+
+const router = Router();
+
+let simplePassword = null;
+
+export function initAuth() {
+  if (process.env.USE_KEYCLOAK === 'true') {
+    console.log('Auth mode: Keycloak');
+    return;
+  }
+  
+  simplePassword = crypto.randomBytes(16).toString('hex');
+  console.log('\n========================================');
+  console.log('ADMIN PASSWORD (save this - shown once):');
+  console.log(simplePassword);
+  console.log('========================================\n');
+}
+
+export function getAuthMode() {
+  return process.env.USE_KEYCLOAK === 'true' ? 'keycloak' : 'simple';
+}
+
+export function getKeycloakConfig() {
+  return {
+    url: process.env.KEYCLOAK_URL || '',
+    realm: process.env.KEYCLOAK_REALM || '',
+    clientId: process.env.KEYCLOAK_CLIENT_ID || '',
+  };
+}
+
+/**
+ * @openapi
+ * /auth/config:
+ *   get:
+ *     summary: Get authentication configuration
+ *     tags: [Auth]
+ *     responses:
+ *       200:
+ *         description: Auth configuration
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 mode:
+ *                   type: string
+ *                 keycloak:
+ *                   type: object
+ */
+router.get('/config', (req, res) => {
+  res.json({
+    mode: getAuthMode(),
+    keycloak: getKeycloakConfig(),
+  });
+});
+
+/**
+ * @openapi
+ * /auth/login:
+ *   post:
+ *     summary: Login with password
+ *     tags: [Auth]
+ *     requestBody:
+ *       required: true
+ *       content:
+ *         application/json:
+ *           schema:
+ *             type: object
+ *             properties:
+ *               password:
+ *                 type: string
+ *     responses:
+ *       200:
+ *         description: Login successful
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 token:
+ *                   type: string
+ *                 expiresIn:
+ *                   type: integer
+ *       401:
+ *         description: Invalid password
+ */
+router.post('/login', (req, res) => {
+  if (process.env.USE_KEYCLOAK === 'true') {
+    return res.status(400).json({ error: 'Keycloak mode enabled - use OAuth flow' });
+  }
+  
+  const { password } = req.body;
+  
+  if (!password || password !== simplePassword) {
+    return res.status(401).json({ error: 'Invalid password' });
+  }
+  
+  const token = crypto.randomBytes(32).toString('hex');
+  registerToken(token);
+  res.json({ token, expiresIn: 3600 });
+});
+
+export default router;