Add mock mode for web UI development and testing

- Add mock data module with simulated camera search and stream discovery
- Enable mock mode via ?mock=true URL parameter
- Show MOCK MODE indicator when enabled
- Remove statistics cards from discovery screen, keep only progress bar
- Mock mode works independently from Go backend for easier UI testing

webui/web/js/main.js

@@ -8,8 +8,12 @@ import { showToast } from './utils/toast.js';
 
 class StrixApp {
     constructor() {
-        this.cameraAPI = new CameraSearchAPI();
-        this.streamAPI = new StreamDiscoveryAPI();
+        // Check if mock mode is enabled via URL parameter (?mock=true)
+        const urlParams = new URLSearchParams(window.location.search);
+        const useMock = urlParams.get('mock') === 'true';
+
+        this.cameraAPI = new CameraSearchAPI(null, useMock);
+        this.streamAPI = new StreamDiscoveryAPI(null, useMock);
 
         this.searchForm = new SearchForm();
         this.carousel = new StreamCarousel();
@@ -20,6 +24,7 @@ class StrixApp {
         this.selectedMainStream = null;
         this.selectedSubStream = null;
         this.isSelectingSubStream = false;
+        this.useMock = useMock;
 
         this.init();
     }
@@ -27,6 +32,31 @@ class StrixApp {
     init() {
         this.setupEventListeners();
         this.showScreen('address');
+
+        // Show mock mode indicator if enabled
+        if (this.useMock) {
+            this.showMockIndicator();
+        }
+    }
+
+    showMockIndicator() {
+        const indicator = document.createElement('div');
+        indicator.id = 'mock-indicator';
+        indicator.style.cssText = `
+            position: fixed;
+            top: 10px;
+            right: 10px;
+            background: #7E57C2;
+            color: white;
+            padding: 8px 16px;
+            border-radius: 8px;
+            font-size: 14px;
+            font-weight: 600;
+            z-index: 9999;
+            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
+        `;
+        indicator.textContent = 'MOCK MODE';
+        document.body.appendChild(indicator);
     }
 
     setupEventListeners() {