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

templates/index.html

@@ -58,9 +58,8 @@
                 </div>
                 
                 <div class="upload-controls" style="display: none;" id="uploadControls">
-                    <div class="confidence-control">
-                        <label for="confidenceSlider">Confidence Threshold: <span id="confidenceValue">0.5</span></label>
-                        <input type="range" id="confidenceSlider" min="0.1" max="1.0" step="0.1" value="0.5">
+                    <div class="confidence-info">
+                        <p><strong>Confidence Threshold:</strong> 80% (High Precision Mode)</p>
                     </div>
                     <button class="btn btn-success" onclick="processUploadedImage()">
                         <i class="fas fa-search"></i> Detect Memory Modules