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

main.py

@@ -149,8 +149,8 @@ def detect_memory_modules():
                 'success': False
             }), 400
         
-        # Get confidence threshold from form data
-        conf_threshold = float(request.form.get('confidence', 0.5))
+        # Get confidence threshold from form data (default 80%)
+        conf_threshold = float(request.form.get('confidence', 0.8))
         
         # Save uploaded file temporarily
         filename = secure_filename(file.filename)
@@ -219,8 +219,8 @@ def detect_hardcoded_image():
                 'success': False
             }), 404
         
-        # Get confidence threshold from query parameters
-        conf_threshold = float(request.args.get('confidence', 0.5))
+        # Get confidence threshold from query parameters (default 80%)
+        conf_threshold = float(request.args.get('confidence', 0.8))
         
         # Run detection
         detections, annotated_image = detector.detect(
@@ -283,8 +283,8 @@ def detect_base64_image():
                 'success': False
             }), 400
         
-        # Get confidence threshold
-        conf_threshold = float(data.get('confidence', 0.5))
+        # Get confidence threshold (default 80%)
+        conf_threshold = float(data.get('confidence', 0.8))
         
         # Decode base64 image
         try: