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/view_orders.html

@@ -25,13 +25,14 @@ table.view-orders-table.scan-table thead th {
     line-height: 1.3 !important;
     padding: 6px 3px !important;
     font-size: 11px !important;
-    background-color: #e9ecef !important;
+    background-color: var(--header-bg-color) !important;
+    color: var(--header-text-color) !important;
     font-weight: bold !important;
     text-transform: none !important;
     letter-spacing: 0 !important;
     overflow: visible !important;
     box-sizing: border-box !important;
-    border: 1px solid #ddd !important;
+    border: 1px solid var(--border-color) !important;
     text-overflow: clip !important;
     position: relative !important;
 }
@@ -41,7 +42,9 @@ table.view-orders-table.scan-table tbody td {
     padding: 4px 2px !important;
     font-size: 10px !important;
     text-align: center !important;
-    border: 1px solid #ddd !important;
+    border: 1px solid var(--border-color) !important;
+    background-color: var(--card-bg-color) !important;
+    color: var(--text-color) !important;
     white-space: nowrap !important;
     overflow: hidden !important;
     text-overflow: ellipsis !important;
@@ -68,7 +71,7 @@ table.view-orders-table.scan-table tbody td {
 
 /* HOVER EFFECTS */
 table.view-orders-table.scan-table tbody tr:hover td {
-    background-color: #f8f9fa !important;
+    background-color: var(--hover-color) !important;
 }
 
 /* COLUMN WIDTH SPECIFICATIONS */