feat: initial implementation of People Counter web app

- Add Flask application with MJPEG video streaming
- Implement OpenCV DNN face detection module
- Add zone-based entry/exit tracking with cooldown mechanism
- Create web interface with real-time WebSocket updates
- Add model download script and comprehensive README
- Include OpenCV DNN model files for face detection

static/css/style.css

@@ -0,0 +1,222 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    min-height: 100vh;
+    color: #333;
+}
+
+.container {
+    max-width: 1400px;
+    margin: 0 auto;
+    padding: 20px;
+}
+
+header {
+    text-align: center;
+    color: white;
+    margin-bottom: 30px;
+}
+
+header h1 {
+    font-size: 2.5em;
+    margin-bottom: 10px;
+    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
+}
+
+.subtitle {
+    font-size: 1.1em;
+    opacity: 0.9;
+}
+
+main {
+    background: white;
+    border-radius: 15px;
+    padding: 30px;
+    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
+}
+
+.video-section {
+    margin-bottom: 30px;
+}
+
+.video-container {
+    position: relative;
+    background: #000;
+    border-radius: 10px;
+    overflow: hidden;
+    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
+}
+
+#videoStream {
+    width: 100%;
+    height: auto;
+    display: block;
+    max-height: 600px;
+    object-fit: contain;
+}
+
+.status-indicator {
+    position: absolute;
+    top: 15px;
+    right: 15px;
+    width: 15px;
+    height: 15px;
+    border-radius: 50%;
+    background: #4caf50;
+    box-shadow: 0 0 10px rgba(76, 175, 80, 0.6);
+    animation: pulse 2s infinite;
+}
+
+.status-indicator.warning {
+    background: #ff9800;
+    box-shadow: 0 0 10px rgba(255, 152, 0, 0.6);
+}
+
+.status-indicator.danger {
+    background: #f44336;
+    box-shadow: 0 0 10px rgba(244, 67, 54, 0.6);
+}
+
+@keyframes pulse {
+    0%, 100% {
+        opacity: 1;
+    }
+    50% {
+        opacity: 0.5;
+    }
+}
+
+.stats-section {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+    gap: 20px;
+    margin-bottom: 30px;
+}
+
+.stat-card {
+    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
+    border-radius: 10px;
+    padding: 25px;
+    text-align: center;
+    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
+    transition: transform 0.3s ease, box-shadow 0.3s ease;
+}
+
+.stat-card:hover {
+    transform: translateY(-5px);
+    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
+}
+
+.stat-card.warning {
+    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
+}
+
+.stat-card.danger {
+    background: linear-gradient(135deg, #fab1a0 0%, #e17055 100%);
+    color: white;
+}
+
+.stat-label {
+    font-size: 0.9em;
+    color: #666;
+    margin-bottom: 10px;
+    text-transform: uppercase;
+    letter-spacing: 1px;
+    font-weight: 600;
+}
+
+.stat-card.danger .stat-label {
+    color: rgba(255, 255, 255, 0.9);
+}
+
+.stat-value {
+    font-size: 3em;
+    font-weight: bold;
+    color: #333;
+    margin-bottom: 5px;
+}
+
+.stat-card.danger .stat-value {
+    color: white;
+}
+
+.stat-entered {
+    color: #4caf50;
+}
+
+.stat-exited {
+    color: #f44336;
+}
+
+.stat-subtitle {
+    font-size: 0.85em;
+    color: #888;
+    margin-top: 5px;
+}
+
+.stat-card.danger .stat-subtitle {
+    color: rgba(255, 255, 255, 0.9);
+}
+
+.controls-section {
+    text-align: center;
+}
+
+.reset-btn {
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    color: white;
+    border: none;
+    padding: 15px 40px;
+    font-size: 1.1em;
+    border-radius: 25px;
+    cursor: pointer;
+    transition: all 0.3s ease;
+    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
+    font-weight: 600;
+}
+
+.reset-btn:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
+}
+
+.reset-btn:active {
+    transform: translateY(0);
+}
+
+footer {
+    text-align: center;
+    color: white;
+    margin-top: 30px;
+    opacity: 0.8;
+}
+
+/* Responsive design */
+@media (max-width: 768px) {
+    header h1 {
+        font-size: 2em;
+    }
+    
+    .stat-value {
+        font-size: 2.5em;
+    }
+    
+    main {
+        padding: 20px;
+    }
+}
+
+/* Animation for count updates */
+.stat-value {
+    transition: transform 0.2s ease;
+}
+
+.stat-value.updated {
+    transform: scale(1.1);
+}