fix: enforce gallery access and consolidate gallery workflows (#1357)

Harden gallery authentication and authorization, consolidate gallery workflows, and prevent token-bearing URLs from leaking through nginx request error logs.

backend/jest.setup.js

@@ -1,3 +1,18 @@
+// Supertest 6 binds an IPv6 wildcard listener but hardcodes an IPv4 URL.
+// macOS can allocate that IPv6 port while a different IPv4 service owns it.
+// Address the listener's actual family so a test cannot reach that service.
+jest.mock('supertest/lib/test', () => {
+  const Test = jest.requireActual('supertest/lib/test');
+  const serverAddress = Test.prototype.serverAddress;
+  Test.prototype.serverAddress = function(app, path) {
+    const url = serverAddress.call(this, app, path);
+    return app.address()?.family === 'IPv6'
+      ? url.replace('://127.0.0.1:', '://[::1]:')
+      : url;
+  };
+  return Test;
+});
+
 beforeAll(() => {
   process.env.NODE_ENV = 'test';
   process.env.JWT_SECRET = 'test-secret';
@@ -8,3 +23,11 @@ beforeAll(() => {
     process.env.STORAGE_PATH = '/storage';
   }
 });
+
+// Dispose resources loaded by this suite using the application's draining
+// shutdown. Individual fixtures still own temporary files and other DB pools.
+afterAll(async () => {
+  await require('./src/services/serviceShutdown').stopServices();
+  const loadedDb = require.cache[require.resolve('./src/database/db')];
+  if (typeof loadedDb?.exports.db?.destroy === 'function') await loadedDb.exports.db.destroy();
+});