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/scan.html

@@ -22,6 +22,74 @@ document.addEventListener('DOMContentLoaded', function() {
     const defectCodeInput = document.getElementById('defect_code');
     const form = document.querySelector('.form-centered');
     
+    // Load saved operator codes from localStorage (only Quality Operator Code)
+    function loadSavedCodes() {
+        const savedOperatorCode = localStorage.getItem('scan_operator_code');
+        
+        if (savedOperatorCode) {
+            operatorCodeInput.value = savedOperatorCode;
+        }
+    }
+    
+    // Save operator codes to localStorage (only Quality Operator Code)
+    function saveCodes() {
+        if (operatorCodeInput.value.startsWith('OP')) {
+            localStorage.setItem('scan_operator_code', operatorCodeInput.value);
+        }
+    }
+    
+    // Clear saved codes from localStorage (only Quality Operator Code)
+    function clearSavedCodes() {
+        localStorage.removeItem('scan_operator_code');
+        operatorCodeInput.value = '';
+        showSuccessMessage('Quality Operator code cleared!');
+        operatorCodeInput.focus();
+    }
+    
+    // Show success message
+    function showSuccessMessage(message) {
+        const successDiv = document.createElement('div');
+        successDiv.className = 'success-message';
+        successDiv.textContent = message;
+        successDiv.style.cssText = `
+            position: fixed;
+            top: 20px;
+            right: 20px;
+            background: #4CAF50;
+            color: white;
+            padding: 15px 20px;
+            border-radius: 4px;
+            z-index: 1000;
+            font-weight: bold;
+            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
+        `;
+        document.body.appendChild(successDiv);
+        
+        setTimeout(() => {
+            if (document.body.contains(successDiv)) {
+                document.body.removeChild(successDiv);
+            }
+        }, 3000);
+    }
+    
+    // Load saved codes on page load
+    loadSavedCodes();
+    
+    // Focus on the first empty field
+    setTimeout(() => {
+        if (!operatorCodeInput.value) {
+            operatorCodeInput.focus();
+        } else if (!cpCodeInput.value) {
+            cpCodeInput.focus();
+        } else if (!oc1CodeInput.value) {
+            oc1CodeInput.focus();
+        } else if (!oc2CodeInput.value) {
+            oc2CodeInput.focus();
+        } else {
+            defectCodeInput.focus();
+        }
+    }, 100);
+    
     // Create error message element for operator code
     const operatorErrorMessage = document.createElement('div');
     operatorErrorMessage.className = 'error-message';
@@ -333,8 +401,21 @@ document.addEventListener('DOMContentLoaded', function() {
             const seconds = String(now.getSeconds()).padStart(2, '0');
             timeInput.value = `${hours}:${minutes}:${seconds}`;
             
+            // Save operator codes before submitting
+            saveCodes();
+            
             // Submit the form
             form.submit();
+            
+            // Clear CP, OC1, OC2, and defect code fields after successful submission
+            setTimeout(() => {
+                cpCodeInput.value = '';
+                oc1CodeInput.value = '';
+                oc2CodeInput.value = '';
+                defectCodeInput.value = '';
+                showSuccessMessage('Scan submitted successfully!');
+                cpCodeInput.focus();
+            }, 100);
         }
     });
     
@@ -425,6 +506,7 @@ 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 btn-secondary" onclick="clearSavedCodes()" style="margin-top: 10px; background-color: #6c757d;">Clear Quality Operator</button>
         </form>
     </div>