feat: Major system improvements and production deployment

✨ New Features:
- Added view_orders route with proper table display
- Implemented CSV upload with preview workflow and date parsing
- Added production WSGI server configuration with Gunicorn
- Created comprehensive production management scripts

🔧 Bug Fixes:
- Fixed upload_data route column mapping for actual CSV structure
- Resolved print module database queries and template rendering
- Fixed view orders navigation routing (was pointing to JSON API)
- Corrected barcode display width constraints in print module
- Added proper date format parsing for MySQL compatibility

🎨 UI/UX Improvements:
- Updated view_orders template with theme-compliant styling
- Hidden barcode text in print module preview for cleaner display
- Enhanced CSV upload with two-step preview-then-save workflow
- Improved error handling and debugging throughout upload process

🚀 Production Infrastructure:
- Added Gunicorn WSGI server with proper configuration
- Created systemd service for production deployment
- Implemented production management scripts (start/stop/status)
- Added comprehensive logging setup
- Updated requirements.txt with production dependencies

📊 Database & Data:
- Enhanced order_for_labels table compatibility
- Fixed column mappings for real CSV data structure
- Added proper date parsing and validation
- Improved error handling with detailed debugging

🔧 Technical Debt:
- Reorganized database setup documentation
- Added proper error handling throughout upload workflow
- Enhanced debugging capabilities for troubleshooting
- Improved code organization and documentation

py_app/app/templates/fg_scan.html

@@ -23,6 +23,80 @@ document.addEventListener('DOMContentLoaded', function() {
     const defectCodeInput = document.getElementById('defect_code');
     const form = document.getElementById('fg-scan-form');
     
+    // Restore saved operator code from localStorage (only Quality Operator Code)
+    const savedOperatorCode = localStorage.getItem('fg_scan_operator_code');
+    
+    if (savedOperatorCode) {
+        operatorCodeInput.value = savedOperatorCode;
+    }
+    
+    // Check if we need to clear fields after a successful submission
+    const shouldClearAfterSubmit = localStorage.getItem('fg_scan_clear_after_submit');
+    if (shouldClearAfterSubmit === 'true') {
+        // Clear the flag
+        localStorage.removeItem('fg_scan_clear_after_submit');
+        localStorage.removeItem('fg_scan_last_cp');
+        localStorage.removeItem('fg_scan_last_defect');
+        
+        // Clear CP code, OC1, OC2, and defect code for next scan
+        cpCodeInput.value = '';
+        oc1CodeInput.value = '';
+        oc2CodeInput.value = '';
+        defectCodeInput.value = '';
+        
+        // Show success indicator
+        setTimeout(function() {
+            // Focus on CP code field for next scan
+            cpCodeInput.focus();
+            
+            // Add visual feedback
+            const successIndicator = document.createElement('div');
+            successIndicator.style.cssText = `
+                position: fixed;
+                top: 20px;
+                right: 20px;
+                background: #4CAF50;
+                color: white;
+                padding: 10px 20px;
+                border-radius: 5px;
+                z-index: 1000;
+                box-shadow: 0 2px 10px rgba(0,0,0,0.2);
+                font-weight: bold;
+            `;
+            successIndicator.textContent = '✅ Scan recorded! Ready for next scan';
+            document.body.appendChild(successIndicator);
+            
+            // Remove success indicator after 3 seconds
+            setTimeout(function() {
+                if (successIndicator.parentNode) {
+                    successIndicator.parentNode.removeChild(successIndicator);
+                }
+            }, 3000);
+        }, 100);
+    }
+    
+    // Focus on the first empty required field (only if not clearing after submit)
+    if (shouldClearAfterSubmit !== 'true') {
+        if (!operatorCodeInput.value) {
+            operatorCodeInput.focus();
+        } else if (!oc1CodeInput.value) {
+            oc1CodeInput.focus();
+        } else if (!oc2CodeInput.value) {
+            oc2CodeInput.focus();
+        } else if (!cpCodeInput.value) {
+            cpCodeInput.focus();
+        } else {
+            defectCodeInput.focus();
+        }
+    }
+    
+    // Save operator codes to localStorage when they change (only Quality Operator Code)
+    operatorCodeInput.addEventListener('input', function() {
+        if (this.value.startsWith('OP') && this.value.length >= 3) {
+            localStorage.setItem('fg_scan_operator_code', this.value);
+        }
+    });
+    
     // Create error message element for operator code
     const operatorErrorMessage = document.createElement('div');
     operatorErrorMessage.className = 'error-message';
@@ -338,6 +412,11 @@ document.addEventListener('DOMContentLoaded', function() {
             const seconds = String(now.getSeconds()).padStart(2, '0');
             timeInput.value = `${hours}:${minutes}:${seconds}`;
             
+            // Save current CP code and defect code to localStorage for clearing after reload
+            localStorage.setItem('fg_scan_clear_after_submit', 'true');
+            localStorage.setItem('fg_scan_last_cp', cpCodeInput.value);
+            localStorage.setItem('fg_scan_last_defect', defectCodeInput.value);
+            
             // Submit the form
             form.submit();
         }
@@ -399,6 +478,27 @@ document.addEventListener('DOMContentLoaded', function() {
             }
         }
     });
+    
+    // Add functionality for clear saved codes button
+    const clearSavedBtn = document.getElementById('clear-saved-btn');
+    clearSavedBtn.addEventListener('click', function() {
+        if (confirm('Clear saved Quality Operator code? You will need to re-enter it.')) {
+            // Clear localStorage (only Quality Operator Code)
+            localStorage.removeItem('fg_scan_operator_code');
+            localStorage.removeItem('fg_scan_clear_after_submit');
+            localStorage.removeItem('fg_scan_last_cp');
+            localStorage.removeItem('fg_scan_last_defect');
+            
+            // Clear Quality Operator Code field only
+            operatorCodeInput.value = '';
+            
+            // Focus on operator code field
+            operatorCodeInput.focus();
+            
+            // Show confirmation
+            alert('✅ Saved Quality Operator code cleared! Please re-enter your operator code.');
+        }
+    });
 });
 </script>
 {% endblock %}
@@ -430,6 +530,7 @@ document.addEventListener('DOMContentLoaded', function() {
             <input type="text" id="time" name="time" value="{{ now().strftime('%H:%M:%S') }}" readonly>
 
             <button type="submit" class="btn">Submit</button>
+            <button type="button" class="btn" id="clear-saved-btn" style="background-color: #ff6b6b; margin-left: 10px;">Clear Quality Operator</button>
         </form>
     </div>