refactor: kb & station & terminal

app/Models/Guide.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\SoftDeletes;
@@ -47,12 +48,9 @@ class Guide extends Model
         return $this->belongsTo(User::class, 'created_by');
     }
 
-    public function terminals()
+    public function stations()
     {
-        return $this->belongsToMany(Terminal::class, 'terminal_guides')
-                    ->withPivot('priority')
-                    ->withTimestamps()
-                    ->orderBy('priority');
+        return $this->belongsToMany(Station::class);
     }
 
     public function scopePublished($query)
@@ -65,6 +63,23 @@ class Guide extends Model
         return $query->where('category', $category);
     }
 
+    /**
+     * 按用户线站过滤：全局 Guide（无线站关联）+ 用户线站关联的 Guide
+     */
+    public function scopeAccessibleBy(Builder $query, User $user): Builder
+    {
+        if (!$user->hasStationRestriction()) {
+            return $query;
+        }
+
+        $stationIds = $user->getAccessibleStationIds();
+
+        return $query->where(function (Builder $q) use ($stationIds) {
+            $q->whereDoesntHave('stations')
+              ->orWhereHas('stations', fn ($sq) => $sq->whereIn('stations.id', $stationIds));
+        });
+    }
+
     public function getActivitylogOptions(): LogOptions
     {
         return LogOptions::defaults()