chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/config/database.cjs

@@ -0,0 +1,26 @@
+'use strict';
+require('dotenv').config();
+
+const useSSL = process.env.DB_SSL !== 'false';
+
+const base = {
+  username: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  database: process.env.DB_NAME,
+  host:     process.env.DB_HOST,
+  port:     parseInt(process.env.DB_PORT, 10) || 5432,
+  dialect:  'postgres',
+  dialectOptions: {
+    ...(useSSL && {
+      ssl: {
+        require: true,
+        rejectUnauthorized: false,
+      },
+    }),
+  },
+};
+
+module.exports = {
+  development: base,
+  production:  base,
+};