Refactor create method to support multiple record creation

Replaced `@api.model` with `@api.model_create_multi` to enable batch creation of records. Updated logic to handle a list of value dictionaries (`vals_list`) instead of a single `vals` dictionary. This improves performance and aligns with best practices for handling record creation in Odoo.

deltatech_dc/models/deltatech_dc.py

@@ -39,12 +39,12 @@ def _compute_display_name(self):
         for dc in self:
             dc.display_name = dc.product_id + " (" + dc.name + "/" + dc.date + ")"
 
-    @api.model
-    def create(self, vals):
-        if "company_id" in vals:
-            self = self.with_company(vals["company_id"])
-        if vals.get("name", _("New")) == _("New"):
-            vals["name"] = self.env["ir.sequence"].next_by_code("declaration.conformity") or _("New")
-
-        result = super().create(vals)
-        return result
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            if "company_id" in vals:
+                self = self.with_company(vals["company_id"])
+            if vals.get("name", _("New")) == _("New"):
+                vals["name"] = self.env["ir.sequence"].next_by_code("declaration.conformity") or _("New")
+
+        return super().create(vals_list)