feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/static/manifest.json

@@ -0,0 +1,90 @@
+{
+  "name": "Mercedes-Benz MYP Platform",
+  "short_name": "MYP",
+  "description": "3D-Druck Management System",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0f172a",
+  "theme_color": "#0f172a",
+  "orientation": "portrait-primary",
+  "scope": "/",
+  "lang": "de",
+  "categories": ["productivity", "business"],
+  "icons": [
+    {
+      "src": "static/icons/mercedes-logo.svg",
+      "sizes": "192x192",
+      "type": "image/svg+xml"
+    },
+    {
+      "src": "static/icons/mercedes-logo.svg",
+      "sizes": "512x512",
+      "type": "image/svg+xml"
+    },
+    {
+      "src": "static/icons/icon-144x144.png",
+      "sizes": "144x144",
+      "type": "image/png",
+      "purpose": "maskable any"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Dashboard",
+      "url": "/dashboard",
+      "description": "Übersicht anzeigen"
+    },
+    {
+      "name": "Drucker",
+      "url": "/printers",
+      "description": "Drucker verwalten"
+    },
+    {
+      "name": "Druckaufträge",
+      "url": "/jobs",
+      "description": "Druckaufträge verwalten"
+    }
+  ],
+  "screenshots": [],
+  "prefer_related_applications": false,
+  "edge_side_panel": {
+    "preferred_width": 400
+  },
+  "launch_handler": {
+    "client_mode": "navigate-existing"
+  },
+  "protocol_handlers": [
+    {
+      "protocol": "web+myp",
+      "url": "/handle?url=%s"
+    }
+  ],
+  "file_handlers": [
+    {
+      "action": "/jobs/upload",
+      "accept": {
+        "model/gcode": [".gcode", ".g"],
+        "model/stl": [".stl"],
+        "model/obj": [".obj"],
+        "model/3mf": [".3mf"]
+      }
+    }
+  ],
+  "share_target": {
+    "action": "/jobs/share",
+    "method": "POST",
+    "enctype": "multipart/form-data",
+    "params": {
+      "title": "title",
+      "text": "text",
+      "url": "url",
+      "files": [
+        {
+          "name": "files",
+          "accept": ["model/gcode", "model/stl", "model/obj", "model/3mf"]
+        }
+      ]
+    }
+  },
+  "offline_enabled": true
+}