feat: add configurable timeout for public database TCP proxy

Adds a per-database 'Proxy Timeout' setting for publicly exposed databases.
The nginx stream proxy_timeout can now be configured in the UI, defaulting
to 3600s (1 hour) instead of nginx's 10min default. Set to 0 for no timeout.

Fixes #7743

database/migrations/2026_02_27_000000_add_public_port_timeout_to_databases.php

@@ -0,0 +1,60 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $tables = [
+            'standalone_postgresqls',
+            'standalone_mysqls',
+            'standalone_mariadbs',
+            'standalone_redis',
+            'standalone_mongodbs',
+            'standalone_clickhouses',
+            'standalone_keydbs',
+            'standalone_dragonflies',
+            'service_databases',
+        ];
+
+        foreach ($tables as $table) {
+            if (Schema::hasTable($table) && !Schema::hasColumn($table, 'public_port_timeout')) {
+                Schema::table($table, function (Blueprint $table) {
+                    $table->integer('public_port_timeout')->nullable()->default(3600)->after('public_port');
+                });
+            }
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        $tables = [
+            'standalone_postgresqls',
+            'standalone_mysqls',
+            'standalone_mariadbs',
+            'standalone_redis',
+            'standalone_mongodbs',
+            'standalone_clickhouses',
+            'standalone_keydbs',
+            'standalone_dragonflies',
+            'service_databases',
+        ];
+
+        foreach ($tables as $table) {
+            if (Schema::hasTable($table) && Schema::hasColumn($table, 'public_port_timeout')) {
+                Schema::table($table, function (Blueprint $table) {
+                    $table->dropColumn('public_port_timeout');
+                });
+            }
+        }
+    }
+};