Small update

config/app_config.yaml

@@ -1,48 +1,41 @@
 database:
-  path: "data/detections.db"
-
+  path: data/detections.db
 image_repository:
-  base_path: ""  # Set by user through GUI
+  base_path: ''
   allowed_extensions:
-    - ".jpg"
-    - ".jpeg"
-    - ".png"
-    - ".tif"
-    - ".tiff"
-    - ".bmp"
-
+  - .jpg
+  - .jpeg
+  - .png
+  - .tif
+  - .tiff
+  - .bmp
 models:
-  default_base_model: "yolov8s.pt"
-  models_directory: "data/models"
-
+  default_base_model: yolov8s.pt
+  models_directory: data/models
 training:
   default_epochs: 100
   default_batch_size: 16
   default_imgsz: 640
   default_patience: 50
   default_lr0: 0.01
-
 detection:
   default_confidence: 0.25
   default_iou: 0.45
   max_batch_size: 100
-
 visualization:
   bbox_colors:
-    organelle: "#FF6B6B"
-    membrane_branch: "#4ECDC4"
-    default: "#00FF00"
+    organelle: '#FF6B6B'
+    membrane_branch: '#4ECDC4'
+    default: '#00FF00'
   bbox_thickness: 2
   font_size: 12
-
 export:
   formats:
   - csv
   - json
   - excel
-  default_format: "csv"
-
+  default_format: csv
 logging:
-  level: "INFO"
-  file: "logs/app.log"
-  format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+  level: INFO
+  file: logs/app.log
+  format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'