Faza 3.4: Finanțe — Plăți + Cheltuieli + Cashflow

Schema:
- payments: client_id, work_order_id, user_id (operator), paid_at, amount,
  method (cash/card/transfer/mobile), reference, notes
- expenses: supplier_id, purchase_id, paid_at, category (salary/purchase/rent/
  utilities/advance/tax/fuel/tools/marketing/other), name, amount, method, ref

Logică auto:
- Payment::saved/deleted recalculează automat work_order.pay_status
  (unpaid → partial → paid) based on suma totală vs work_order.total
- WO model are noi metode: payments(), paidAmount(), balanceDue()

Filament resources (group Finanțe):
- PaymentResource: form cu legare opțională la WO + client; tabel cu
  Sum summary, filtre azi/luna_curentă/method
- ExpenseResource: 10 categorii preset, badge categ, total summary,
  filtru luna curentă
- PaymentsRelationManager pe WO: "Plăți" tab cu auto-fill client_id +
  user_id la creare

Widget FinanceOverview:
- Încasări (luna), Cheltuieli (luna), Profit (luna), Datorii clienți
- color coded: profit verde sau roșu, datorii galben/verde

Settings page fix (Filament v5):
- mount() folosește acum $this->form->fill([...]) în loc de $this->data direct
- Filament v5 cere fill explicit pentru a inițializa state-ul schemei

Seed:
- 1 plată parțială pe fișa BMW (200 din 750)
- 6 cheltuieli demo: 3 salarii, chirie, electricitate, achiziție piese

Total Filament tenant routes: 69.

app/Models/Tenant/Expense.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Models\Tenant;
+
+use App\Models\Concerns\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Expense extends Model
+{
+    use BelongsToTenant, SoftDeletes;
+
+    public const CATEGORIES = [
+        'salary' => 'Salariu',
+        'purchase' => 'Achiziție piese',
+        'rent' => 'Chirie',
+        'utilities' => 'Utilități',
+        'advance' => 'Avans',
+        'tax' => 'Taxe',
+        'fuel' => 'Combustibil',
+        'tools' => 'Scule / consumabile',
+        'marketing' => 'Marketing',
+        'other' => 'Altele',
+    ];
+
+    public const METHODS = [
+        'cash' => 'Numerar',
+        'card' => 'Card',
+        'transfer' => 'Virament',
+        'mobile' => 'Mobile pay',
+    ];
+
+    protected $fillable = [
+        'company_id', 'supplier_id', 'purchase_id', 'user_id',
+        'paid_at', 'category', 'name', 'amount', 'method', 'reference', 'notes',
+    ];
+
+    protected $casts = [
+        'paid_at' => 'date',
+        'amount' => 'decimal:2',
+    ];
+
+    public function supplier(): BelongsTo
+    {
+        return $this->belongsTo(Supplier::class);
+    }
+
+    public function purchase(): BelongsTo
+    {
+        return $this->belongsTo(Purchase::class);
+    }
+}

app/Models/Tenant/Payment.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace App\Models\Tenant;
+
+use App\Models\Concerns\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Payment extends Model
+{
+    use BelongsToTenant, SoftDeletes;
+
+    public const METHODS = [
+        'cash' => 'Numerar',
+        'card' => 'Card',
+        'transfer' => 'Virament',
+        'mobile' => 'Mobile pay',
+    ];
+
+    protected $fillable = [
+        'company_id', 'client_id', 'work_order_id', 'user_id',
+        'paid_at', 'amount', 'method', 'reference', 'notes',
+    ];
+
+    protected $casts = [
+        'paid_at' => 'date',
+        'amount' => 'decimal:2',
+    ];
+
+    public function client(): BelongsTo
+    {
+        return $this->belongsTo(Client::class);
+    }
+
+    public function workOrder(): BelongsTo
+    {
+        return $this->belongsTo(WorkOrder::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    /**
+     * After save/delete, recompute the work order's pay_status.
+     */
+    protected static function booted(): void
+    {
+        $sync = function (self $payment) {
+            if (! $payment->work_order_id) {
+                return;
+            }
+            $wo = WorkOrder::withoutGlobalScopes()->find($payment->work_order_id);
+            if (! $wo) {
+                return;
+            }
+            $paid = (float) static::withoutGlobalScopes()
+                ->where('work_order_id', $wo->id)
+                ->whereNull('deleted_at')
+                ->sum('amount');
+            $total = (float) $wo->total;
+
+            if ($paid <= 0) {
+                $wo->pay_status = 'unpaid';
+            } elseif ($paid + 0.01 < $total) {
+                $wo->pay_status = 'partial';
+            } else {
+                $wo->pay_status = 'paid';
+            }
+            $wo->save();
+        };
+
+        static::saved($sync);
+        static::deleted($sync);
+    }
+}

app/Models/Tenant/WorkOrder.php

@@ -73,6 +73,21 @@ class WorkOrder extends Model
         return $this->hasMany(WorkOrderPart::class);
     }
 
+    public function payments(): HasMany
+    {
+        return $this->hasMany(Payment::class);
+    }
+
+    public function paidAmount(): float
+    {
+        return (float) $this->payments()->sum('amount');
+    }
+
+    public function balanceDue(): float
+    {
+        return max(0.0, (float) $this->total - $this->paidAmount());
+    }
+
     public function recalcTotal(): void
     {
         $worksTotal = $this->works()->sum('total');