feat: add comprehensive unit and integration testing infrastructure

- Backend: pytest with unit tests (auth, rbac, config) and integration tests (auth flow, docker, files)
- Frontend: vitest with unit tests (api client) and component tests (login)
- CI: Gitea Actions workflow for automated testing with coverage reports
- Documentation: TESTING.md guide with setup, usage, and best practices
- Coverage goals: 80%+ backend, 70%+ frontend

dashboard/frontend/tests/setup.js

@@ -0,0 +1,85 @@
+/**
+ * Global test setup for Vitest
+ */
+import { vi } from 'vitest';
+
+// Mock Web APIs that may not be available in jsdom
+
+// Mock WebSocket
+global.WebSocket = class MockWebSocket {
+  constructor(url) {
+    this.url = url;
+    this.readyState = 0; // CONNECTING
+    setTimeout(() => {
+      this.readyState = 1; // OPEN
+      this.onopen?.();
+    }, 0);
+  }
+  send(data) {}
+  close() {
+    this.readyState = 3; // CLOSED
+    this.onclose?.();
+  }
+  addEventListener(event, handler) {
+    this[`on${event}`] = handler;
+  }
+};
+
+// Mock Web Speech API
+global.SpeechRecognition = vi.fn(() => ({
+  start: vi.fn(),
+  stop: vi.fn(),
+  abort: vi.fn(),
+  addEventListener: vi.fn(),
+  removeEventListener: vi.fn()
+}));
+
+global.webkitSpeechRecognition = global.SpeechRecognition;
+
+global.speechSynthesis = {
+  speak: vi.fn(),
+  cancel: vi.fn(),
+  pause: vi.fn(),
+  resume: vi.fn(),
+  getVoices: vi.fn(() => [])
+};
+
+global.SpeechSynthesisUtterance = vi.fn();
+
+// Mock WebAuthn
+global.navigator.credentials = {
+  create: vi.fn(),
+  get: vi.fn()
+};
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: vi.fn(),
+  setItem: vi.fn(),
+  removeItem: vi.fn(),
+  clear: vi.fn()
+};
+global.localStorage = localStorageMock;
+
+// Mock ResizeObserver
+global.ResizeObserver = vi.fn(() => ({
+  observe: vi.fn(),
+  unobserve: vi.fn(),
+  disconnect: vi.fn()
+}));
+
+// Mock MutationObserver
+global.MutationObserver = vi.fn(() => ({
+  observe: vi.fn(),
+  disconnect: vi.fn(),
+  takeRecords: vi.fn(() => [])
+}));
+
+// Mock fetch
+global.fetch = vi.fn();
+
+// Reset mocks before each test
+beforeEach(() => {
+  vi.clearAllMocks();
+  localStorageMock.getItem.mockReturnValue(null);
+});