Add HL3D branding, Etsy Live/Draft paging and Projects lifecycle

Replace the old touchmark/PNG identity with the supplied lockup and
monogram, segmented role-aware navigation, Live/Draft listing filters
with generation-based cache invalidation, and admin Projects covering
immutable file revisions, listing live pointers, and exact-decimal
filament/packaging/shipping costing. Additive schema only; no Etsy
publication. Isolated clone tests: 301 tests, 1162 assertions.

app/Models/Project.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\ProjectFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Project extends Model
+{
+    /** @use HasFactory<ProjectFactory> */
+    use HasFactory;
+
+    /** @var list<string> */
+    public const STAGES = ['design', 'ready', 'live', 'retired'];
+
+    protected $fillable = ['reference', 'title', 'notes', 'stage', 'currency', 'created_by', 'archived_at'];
+
+    protected function casts(): array
+    {
+        return [
+            'archived_at' => 'datetime',
+        ];
+    }
+
+    public function creator(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    public function revisions(): HasMany
+    {
+        return $this->hasMany(ProjectRevision::class);
+    }
+
+    public function listingLinks(): HasMany
+    {
+        return $this->hasMany(ProjectListingLink::class);
+    }
+
+    public function releases(): HasMany
+    {
+        return $this->hasMany(ProjectRelease::class);
+    }
+
+    public function costSnapshots(): HasMany
+    {
+        return $this->hasMany(ProjectCostSnapshot::class);
+    }
+
+    public function events(): HasMany
+    {
+        return $this->hasMany(ProjectEvent::class)->latest('created_at');
+    }
+
+    public function isArchived(): bool
+    {
+        return $this->archived_at !== null;
+    }
+}