Nextcloud 32/33 Compatibility: Remove deprecated API usage

This commit updates the SnappyMail integration app for Nextcloud to support version 32 and the upcoming version 33.

Key changes:
- Updated `info.xml` to allow `max-version="33"`.
- Refactored `AdminSettings`, `Application`, `FetchController`, `PageController`, `Settings` (command), and `InstallStep` to use Dependency Injection instead of the deprecated `\OC::$server` service container.
- Replaced deprecated `OC_User`, `OC_Util` (e.g. `addScript`), and `OC_App` calls with their `OCP` (public API) counterparts or modern equivalents.
- Updated `SnappyMailHelper` to use `\OCP\Server::get()` for static context access where DI is not possible.
- Moved script and style registration from Controllers (using deprecated `Util::addScript`) to templates using `script()` and `style()` helpers.
- Updated `Settings` console command to extend `Symfony\Component\Console\Command\Command` instead of deprecated `OC\Core\Command\Base`.
- Addressed PHP 8.4+ compatibility by adding explicit property types and nullable types where necessary in the integration code.

Co-authored-by: nextgen-networks <21206978+nextgen-networks@users.noreply.github.com>

plugins/cache-redis/Predis/Connection/Cluster/PredisCluster.php

@@ -52,7 +52,7 @@ class PredisCluster implements ClusterInterface, IteratorAggregate, Countable
     /**
      * @param StrategyInterface $strategy Optional cluster strategy.
      */
-    public function __construct(?StrategyInterface $strategy = null)
+    public function __construct(StrategyInterface $strategy = null)
     {
         $this->strategy = $strategy ?: new PredisStrategy();
         $this->distributor = $this->strategy->getDistributor();

plugins/cache-redis/Predis/Connection/Cluster/RedisCluster.php

@@ -70,7 +70,7 @@ class RedisCluster implements ClusterInterface, IteratorAggregate, Countable
      */
     public function __construct(
         FactoryInterface $connections,
-        ?StrategyInterface $strategy = null
+        StrategyInterface $strategy = null
     ) {
         $this->connections = $connections;
         $this->strategy = $strategy ?: new RedisClusterStrategy();
@@ -273,7 +273,7 @@ class RedisCluster implements ClusterInterface, IteratorAggregate, Countable
      *
      * @param NodeConnectionInterface $connection Optional connection instance.
      */
-    public function askSlotMap(?NodeConnectionInterface $connection = null)
+    public function askSlotMap(NodeConnectionInterface $connection = null)
     {
         if (!$connection && !$connection = $this->getRandomConnection()) {
             return;

plugins/cache-redis/Predis/Connection/CompositeStreamConnection.php

@@ -31,7 +31,7 @@ class CompositeStreamConnection extends StreamConnection implements CompositeCon
      */
     public function __construct(
         ParametersInterface $parameters,
-        ?ProtocolProcessorInterface $protocol = null
+        ProtocolProcessorInterface $protocol = null
     ) {
         $this->parameters = $this->assertParameters($parameters);
         $this->protocol = $protocol ?: new TextProtocolProcessor();

plugins/cache-redis/Predis/Connection/RelayMethods.php

@@ -32,7 +32,7 @@ trait RelayMethods
      * @param  string   $pattern
      * @return bool
      */
-    public function onInvalidated(?callable $callback, ?string $pattern = null)
+    public function onInvalidated(?callable $callback, string $pattern = null)
     {
         return $this->client->onInvalidated($callback, $pattern);
     }
@@ -129,7 +129,7 @@ trait RelayMethods
      * @param  ?int    $db
      * @return bool
      */
-    public function flushMemory(?string $endpointId = null, ?int $db = null)
+    public function flushMemory(string $endpointId = null, int $db = null)
     {
         return $this->client->flushMemory($endpointId, $db);
     }

plugins/cache-redis/Predis/Connection/Replication/MasterSlaveReplication.php

@@ -72,7 +72,7 @@ class MasterSlaveReplication implements ReplicationInterface
     /**
      * {@inheritdoc}
      */
-    public function __construct(?ReplicationStrategy $strategy = null)
+    public function __construct(ReplicationStrategy $strategy = null)
     {
         $this->strategy = $strategy ?: new ReplicationStrategy();
     }

plugins/cache-redis/Predis/Connection/Replication/SentinelReplication.php

@@ -123,7 +123,7 @@ class SentinelReplication implements ReplicationInterface
         $service,
         array $sentinels,
         ConnectionFactoryInterface $connectionFactory,
-        ?ReplicationStrategy $strategy = null
+        ReplicationStrategy $strategy = null
     ) {
         $this->sentinels = $sentinels;
         $this->service = $service;