feat: shop customer accounts (register/login + order history)

Schema:
- shop_customers (company_id, name, phone unique-per-tenant, email, password,
  client_id auto-linked, last_login_at)
- online_orders.shop_customer_id nullable FK

Auth:
- New 'shop' guard (session driver, shop_customers provider) in config/auth.php
- ShopCustomer Authenticatable with hashed password cast and BelongsToTenant
  global scope — login attempts naturally scoped to current tenant subdomain

Flow:
- ShopAuthController: register / login / logout / account
- Register auto-links to existing Client by phone match
- /shop/account: order history (only the logged customer's orders) + profile
- Checkout prefills name/phone/email from logged customer + sets
  shop_customer_id (and client_id from auto-link) on the placed order
- Layout nav switches between Login/Register and "👤 Name + Ieșire"

Tests (8 new):
- register creates customer + auto-login
- register auto-links existing Client by phone
- duplicate phone rejected
- login validates credentials
- /account requires auth (redirects to /shop/login)
- /account lists only the logged customer's orders
- checkout attaches shop_customer_id
- customers tenant-isolated

Full suite: 117 passed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

resources/views/shop/auth/login.blade.php

@@ -0,0 +1,31 @@
+@extends('shop.layout')
+@section('title', 'Login')
+@section('content')
+
+<div style="max-width:380px;margin:0 auto;">
+    <h1 style="font-size:22px;margin-bottom:16px;">Intră în cont</h1>
+
+    @if ($errors->any())
+        <div class="card" style="border-color:#fca5a5;background:#fef2f2;margin-bottom:14px;">
+            <ul style="margin:0;padding-left:18px;color:#991b1b;font-size:14px;">
+                @foreach ($errors->all() as $e)<li>{{ $e }}</li>@endforeach
+            </ul>
+        </div>
+    @endif
+
+    <form method="POST" action="/shop/login" class="card">
+        @csrf
+        <div class="field"><label>Telefon *</label>
+            <input type="text" name="phone" value="{{ old('phone') }}" required placeholder="+373…">
+        </div>
+        <div class="field"><label>Parolă *</label>
+            <input type="password" name="password" required>
+        </div>
+        <button type="submit" class="btn block">Intră</button>
+    </form>
+
+    <p class="muted" style="text-align:center;margin-top:12px;">
+        Nu ai cont? <a href="/shop/register" style="color:inherit;text-decoration:underline;">Înregistrare</a>
+    </p>
+</div>
+@endsection

resources/views/shop/auth/register.blade.php

@@ -0,0 +1,40 @@
+@extends('shop.layout')
+@section('title', 'Înregistrare')
+@section('content')
+
+<div style="max-width:420px;margin:0 auto;">
+    <h1 style="font-size:22px;margin-bottom:16px;">Înregistrare cont</h1>
+
+    @if ($errors->any())
+        <div class="card" style="border-color:#fca5a5;background:#fef2f2;margin-bottom:14px;">
+            <ul style="margin:0;padding-left:18px;color:#991b1b;font-size:14px;">
+                @foreach ($errors->all() as $e)<li>{{ $e }}</li>@endforeach
+            </ul>
+        </div>
+    @endif
+
+    <form method="POST" action="/shop/register" class="card">
+        @csrf
+        <div class="field"><label>Nume *</label>
+            <input type="text" name="name" value="{{ old('name') }}" required>
+        </div>
+        <div class="field"><label>Telefon *</label>
+            <input type="text" name="phone" value="{{ old('phone') }}" required placeholder="+373…">
+        </div>
+        <div class="field"><label>Email</label>
+            <input type="email" name="email" value="{{ old('email') }}">
+        </div>
+        <div class="field"><label>Parolă *</label>
+            <input type="password" name="password" required minlength="6">
+        </div>
+        <div class="field"><label>Confirmă parola *</label>
+            <input type="password" name="password_confirmation" required minlength="6">
+        </div>
+        <button type="submit" class="btn block">Creează cont</button>
+    </form>
+
+    <p class="muted" style="text-align:center;margin-top:12px;">
+        Ai deja cont? <a href="/shop/login" style="color:inherit;text-decoration:underline;">Login</a>
+    </p>
+</div>
+@endsection