Add NAS file manager integration and all pending platform changes

- Installed p7h/nas-file-manager package via private VCS repo
- Published config/nas-file-manager.php with super_admin middleware restriction
- Added NAS env vars to .env.example
- Created admin/nas-storage page with connection info panel and file browser widget
- Added NAS Storage link to admin sidebar (super_admin only)
- Added SuperAdminController@nasStorage method and admin.nas-storage route
- Includes all accumulated branch changes: profile wall, 2FA, audit logs,
  settings panel, country/phone/timezone components, posts, slideshow,
  playlist shares, video downloads/shares, comment likes, notifications,
  social links, and more

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

app/Models/Setting.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Setting extends Model
+{
+    protected $fillable = ['key', 'value'];
+
+    private static array $cache = [];
+
+    public static function get(string $key, mixed $default = null): mixed
+    {
+        if (! array_key_exists($key, self::$cache)) {
+            $row = static::where('key', $key)->first();
+            self::$cache[$key] = $row ? $row->value : $default;
+        }
+        return self::$cache[$key];
+    }
+
+    public static function set(string $key, mixed $value): void
+    {
+        static::updateOrCreate(['key' => $key], ['value' => (string) $value]);
+        self::$cache[$key] = (string) $value;
+    }
+
+    /** Returns the configured FFmpeg binary path, falling back to the config file default. */
+    public static function ffmpegBinary(): string
+    {
+        return static::get('ffmpeg_binary', config('ffmpeg.ffmpeg', '/usr/bin/ffmpeg'));
+    }
+
+    public static function gpuEnabled(): bool
+    {
+        return static::get('gpu_enabled', 'true') === 'true';
+    }
+
+    public static function gpuDevice(): int
+    {
+        return (int) static::get('gpu_device', '0');
+    }
+
+    public static function gpuEncoder(): string
+    {
+        return static::gpuEnabled()
+            ? static::get('gpu_encoder', 'h264_nvenc')
+            : 'libx264';
+    }
+
+    public static function gpuPreset(): string
+    {
+        return static::gpuEnabled()
+            ? static::get('gpu_preset', 'p4')
+            : 'fast';
+    }
+
+    public static function gpuHwaccel(): string
+    {
+        return static::get('gpu_hwaccel', 'cuda');
+    }
+
+    /** Returns the full video codec flags for FFmpeg shell commands. */
+    public static function ffmpegVideoFlags(bool $stillImage = false): string
+    {
+        if (static::gpuEnabled()) {
+            $enc    = static::get('gpu_encoder', 'h264_nvenc');
+            $preset = static::get('gpu_preset',  'p4');
+            $device = static::gpuDevice();
+            $gpuFlag = str_contains($enc, 'nvenc') ? " -gpu {$device}" : '';
+            return "-c:v {$enc} -preset {$preset} -rc vbr -cq 23{$gpuFlag} -pix_fmt yuv420p";
+        }
+        $tune = $stillImage ? ' -tune stillimage' : '';
+        return "-c:v libx264 -preset fast -crf 23{$tune} -pix_fmt yuv420p";
+    }
+
+    /** CPU-only video codec flags — used as automatic fallback when GPU encoding fails. */
+    public static function ffmpegVideoFlagsCpu(bool $stillImage = false): string
+    {
+        $tune = $stillImage ? ' -tune stillimage' : '';
+        return "-c:v libx264 -preset fast -crf 23{$tune} -pix_fmt yuv420p";
+    }
+
+    /** Returns hwaccel decode flags when the input source is a video file. */
+    public static function ffmpegHwaccelFlags(bool $inputIsVideo): string
+    {
+        if (! $inputIsVideo || ! static::gpuEnabled()) return '';
+        $hwaccel = static::get('gpu_hwaccel', 'cuda');
+        $device  = static::gpuDevice();
+        return "-hwaccel {$hwaccel} -hwaccel_device {$device} ";
+    }
+}