Add license key management features and backup functionality

- Updated base template to include a link for license key management.
- Created a new template for license key management with forms for generating and allocating keys, as well as backup options.
- Implemented backup.py for loading and saving licenses to MongoDB, including export and import functionalities.
- Added verify.py for license key verification, user ID generation, and key registration.

Website/backup.py

@@ -0,0 +1,75 @@
+import os
+from datetime import datetime
+from pymongo import MongoClient
+from pymongo.errors import PyMongoError
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+INVOICE_UPLOAD_DIR = os.path.join(BASE_DIR, "static", "uploads", "invoices")
+MONGO_URI = os.environ.get("MONGO_URI", "mongodb://localhost:27017")
+MONGO_DB_NAME = os.environ.get("MONGO_DB_NAME", "Invario_Website")
+LICENSE_COLLECTION = "licenses"
+
+
+def _get_collection():
+    client = MongoClient(MONGO_URI, serverSelectionTimeoutMS=1200)
+    return client, client[MONGO_DB_NAME][LICENSE_COLLECTION]
+
+def load_licenses() -> dict:
+    """Load all licenses from MongoDB and return them as a list."""
+    client = None
+    try:
+        client, col = _get_collection()
+        return list(col.find({}, {"_id": 0}).sort("created_at", 1))
+    except PyMongoError:
+        return []
+    finally:
+        if client:
+            client.close()
+
+
+def save_licenses(data: dict) -> bool:
+    """Replace MongoDB licenses with provided list data."""
+    if not isinstance(data, list):
+        return False
+
+    client = None
+    try:
+        client, col = _get_collection()
+        col.delete_many({})
+
+        prepared = []
+        for item in data:
+            if not isinstance(item, dict):
+                continue
+            license_key = str(item.get("license_key", "")).strip()
+            user_id = str(item.get("user_id", "")).strip()
+            if not license_key:
+                continue
+            prepared.append(
+                {
+                    "user_id": user_id,
+                    "license_key": license_key,
+                    "hwid_uuid": str(item.get("hwid_uuid", "")).strip(),
+                    "created_at": item.get("created_at") or datetime.utcnow().isoformat(timespec="seconds") + "Z",
+                }
+            )
+
+        if prepared:
+            col.insert_many(prepared)
+
+        return True
+    except PyMongoError:
+        return False
+    finally:
+        if client:
+            client.close()
+
+
+def export_backup() -> dict:
+    """Export current licenses content from MongoDB."""
+    return load_licenses()
+
+
+def import_backup(data: dict) -> bool:
+    """Import and restore licenses in MongoDB from backup data."""
+    return save_licenses(data)