Set confidence threshold to 80% and remove slider from frontend

✅ Frontend Changes:
- Removed confidence threshold slider from web interface
- Added fixed 80% confidence display with green info box
- Updated JavaScript to use fixed 0.8 threshold
- Removed slider-related CSS styles

✅ Backend Changes:
- Updated all API endpoints to default to 80% confidence (0.8)
- Modified POST /detect, GET /detect/hardcoded, POST /detect/base64
- Updated comments to reflect new default threshold

✅ Testing Updates:
- Updated test_api.py to use 80% confidence for all tests
- Ensures consistent testing with new threshold

✅ Benefits:
- High precision mode (80% confidence) reduces false positives
- Simplified user interface without threshold adjustment
- Consistent detection behavior across all endpoints

static/script.js

@@ -17,18 +17,13 @@ function initializeApp() {
 function setupEventListeners() {
     // File input change
     document.getElementById('fileInput').addEventListener('change', handleFileSelect);
-    
+
     // Drag and drop
     const uploadArea = document.getElementById('uploadArea');
     uploadArea.addEventListener('dragover', handleDragOver);
     uploadArea.addEventListener('dragleave', handleDragLeave);
     uploadArea.addEventListener('drop', handleDrop);
     uploadArea.addEventListener('click', () => document.getElementById('fileInput').click());
-    
-    // Confidence slider
-    document.getElementById('confidenceSlider').addEventListener('input', function() {
-        document.getElementById('confidenceValue').textContent = this.value;
-    });
 }
 
 async function checkApiStatus() {
@@ -143,23 +138,23 @@ async function processUploadedImage() {
         alert('Please select an image first');
         return;
     }
-    
-    const confidence = document.getElementById('confidenceSlider').value;
+
+    const confidence = 0.8; // Fixed 80% threshold
     showLoading('Processing uploaded image...');
-    
+
     try {
         const formData = new FormData();
         formData.append('image', uploadedFile);
         formData.append('confidence', confidence);
-        
+
         const response = await fetch(`${API_BASE_URL}/detect`, {
             method: 'POST',
             body: formData
         });
-        
+
         const result = await response.json();
         hideLoading();
-        
+
         if (result.success) {
             displayResults(result, 'Uploaded Image Detection');
         } else {
@@ -173,12 +168,12 @@ async function processUploadedImage() {
 
 async function testHardcodedImage() {
     showLoading('Testing hardcoded image...');
-    
+
     try {
-        const response = await fetch(`${API_BASE_URL}/detect/hardcoded?confidence=0.5`);
+        const response = await fetch(`${API_BASE_URL}/detect/hardcoded?confidence=0.8`);
         const result = await response.json();
         hideLoading();
-        
+
         if (result.success) {
             displayResults(result, 'Hardcoded Image Test');
         } else {