Implement contract document download functionality and enhance clearance review status checks

- Added methods to assert clearance reviewable, finalizable, and uploadable statuses in the ContractClearanceService.
- Introduced a new endpoint in ContractsController for downloading contract PDFs.
- Implemented download functionality in the contracts service for both backoffice and portal applications.
- Updated UI components to include download buttons for contract PDFs in relevant pages.
- Enhanced contract request and view pages to support contract document downloads.

apps/edr-freight-web/backoffice/src/components/contracts/ContractClearanceReviewSection.tsx

@@ -583,7 +583,7 @@ function DocReviewCard({
         </Alert>
       )}
 
-      {!readOnly && hasFile && !isApproved && (
+      {!readOnly && hasFile && (
         <Box mt="sm">
           {!queryOpen ? (
             <Group justify="flex-end" gap={8}>
@@ -598,16 +598,18 @@ function DocReviewCard({
               >
                 Open query
               </Button>
-              <Button
-                size="sm"
-                color="edr-green"
-                radius="md"
-                leftSection={<CheckCircle2 size={15} />}
-                disabled={busy}
-                onClick={onApprove}
-              >
-                Approve
-              </Button>
+              {!isApproved && (
+                <Button
+                  size="sm"
+                  color="edr-green"
+                  radius="md"
+                  leftSection={<CheckCircle2 size={15} />}
+                  disabled={busy}
+                  onClick={onApprove}
+                >
+                  Approve
+                </Button>
+              )}
             </Group>
           ) : (
             <Box