Initial commit: Laravel OSINT platform

Multi-user OSINT investigation tool with owner-controlled per-user and
per-group access grants. Includes Sherlock, theHarvester, crt.sh, WHOIS,
and ip-api.com collectors wired through a pluggable Runner/queue pipeline,
investigation search, and printable/CSV/JSON reporting.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Models/Group.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+#[Fillable(['name', 'description', 'owner_id'])]
+class Group extends Model
+{
+    use HasFactory;
+
+    public function owner(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'owner_id');
+    }
+
+    public function members(): BelongsToMany
+    {
+        return $this->belongsToMany(User::class)->withTimestamps();
+    }
+
+    public function investigations(): BelongsToMany
+    {
+        return $this->belongsToMany(Investigation::class, 'investigation_group')
+            ->withPivot('role')
+            ->withTimestamps();
+    }
+
+    public function isAccessibleBy(User $user): bool
+    {
+        return $this->owner_id === $user->id
+            || $this->members()->where('users.id', $user->id)->exists();
+    }
+}