FG Scan form validation improvements with warehouse module updates

- Fixed 3 JavaScript syntax errors in fg_scan.html (lines 951, 840-950, 1175-1215)
- Restored form field validation with proper null safety checks
- Re-enabled auto-advance between form fields
- Re-enabled CP code auto-complete with hyphen detection
- Updated validation error messages with clear format specifications and examples
- Added autocomplete='off' to all input fields
- Removed auto-prefix correction feature
- Updated warehouse routes and modules for box assignment workflow
- Added/improved database initialization scripts
- Updated requirements.txt dependencies

Format specifications implemented:
- Operator Code: OP + 2 digits (example: OP01, OP99)
- CP Code: CP + 8 digits + hyphen + 4 digits (example: CP00000000-0001)
- OC1/OC2 Codes: OC + 2 digits (example: OC01, OC99)
- Defect Code: 3 digits only

app/templates/modules/settings/database_management.html

@@ -348,6 +348,11 @@
                         <p class="mb-1"><strong>Name:</strong> <span id="truncate-table-name"></span></p>
                         <p class="mb-0"><strong>Rows to Delete:</strong> <span id="truncate-row-count" class="badge bg-danger"></span></p>
                     </div>
+
+                    <div id="warehouse-locations-warning" style="display: none;" class="alert alert-warning mt-3 mb-0">
+                        <i class="fas fa-shield-alt"></i>
+                        <strong>Protected Data:</strong> The 2 default warehouse locations (<code>FG_INCOMING</code> and <code>TRUCK_LOADING</code>) will be automatically preserved and not deleted.
+                    </div>
                 </div>
             </div>
 
@@ -564,6 +569,16 @@ document.addEventListener('DOMContentLoaded', function() {
                     confirmTableName.textContent = table;
                 }
                 
+                // Show warehouse_locations protection warning
+                const warehouseWarning = document.getElementById('warehouse-locations-warning');
+                if (warehouseWarning) {
+                    if (table === 'warehouse_locations') {
+                        warehouseWarning.style.display = 'block';
+                    } else {
+                        warehouseWarning.style.display = 'none';
+                    }
+                }
+                
                 // Enable the button
                 truncateBtn.disabled = false;
                 
@@ -577,6 +592,12 @@ document.addEventListener('DOMContentLoaded', function() {
                     truncateInfo.style.display = 'none';
                 }
                 
+                // Hide warehouse warning
+                const warehouseWarning = document.getElementById('warehouse-locations-warning');
+                if (warehouseWarning) {
+                    warehouseWarning.style.display = 'none';
+                }
+                
                 truncateBtn.disabled = true;
             }
         });
@@ -663,8 +684,15 @@ document.addEventListener('DOMContentLoaded', function() {
                     const modal = bootstrap.Modal.getInstance(document.getElementById('confirmTruncateModal'));
                     if (modal) modal.hide();
                     
+                    // Build success message
+                    let successMsg = 'Table cleared successfully!';
+                    if (data.preserved_count > 0) {
+                        successMsg += ` (${data.preserved_count} protected locations preserved)`;
+                    }
+                    successMsg += '\n\nRefreshing page...';
+                    
                     // Show success message
-                    alert('Table cleared successfully! Refreshing page...');
+                    alert(successMsg);
                     
                     // Refresh the page after a short delay
                     setTimeout(() => {