Add initial Code

app/Http/Requests/Auth/LoginRequest.php

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+<?php
+
+namespace App\Http\Requests\Auth;
+
+use App\Models\User;
+use Illuminate\Auth\Events\Lockout;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\RateLimiter;
+use Illuminate\Validation\ValidationException;
+
+class LoginRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'email' => ['required', 'string', 'email'],
+            'password' => ['required', 'string'],
+        ];
+    }
+
+    /**
+     * Validate the request's credentials and return the user without logging them in.
+     *
+     * @throws \Illuminate\Validation\ValidationException
+     */
+    public function validateCredentials(): User
+    {
+        $this->ensureIsNotRateLimited();
+
+        /** @var User|null $user */
+        $user = Auth::getProvider()->retrieveByCredentials($this->only('email', 'password'));
+
+        if (! $user || ! Auth::getProvider()->validateCredentials($user, $this->only('password'))) {
+            RateLimiter::hit($this->throttleKey());
+
+            throw ValidationException::withMessages([
+                'email' => trans('auth.failed'),
+            ]);
+        }
+
+        RateLimiter::clear($this->throttleKey());
+
+        return $user;
+    }
+
+    /**
+     * Ensure the login request is not rate limited.
+     *
+     * @throws \Illuminate\Validation\ValidationException
+     */
+    public function ensureIsNotRateLimited(): void
+    {
+        if (! RateLimiter::tooManyAttempts($this->throttleKey(), 5)) {
+            return;
+        }
+
+        event(new Lockout($this));
+
+        $seconds = RateLimiter::availableIn($this->throttleKey());
+
+        throw ValidationException::withMessages([
+            'email' => trans('auth.throttle', [
+                'seconds' => $seconds,
+                'minutes' => ceil($seconds / 60),
+            ]),
+        ]);
+    }
+
+    /**
+     * Get the rate-limiting throttle key for the request.
+     */
+    public function throttleKey(): string
+    {
+        return $this->string('email')
+            ->lower()
+            ->append('|'.$this->ip())
+            ->transliterate()
+            ->value();
+    }
+}

app/Http/Requests/Settings/ProfileUpdateRequest.php

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+<?php
+
+namespace App\Http\Requests\Settings;
+
+use App\Models\User;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class ProfileUpdateRequest extends FormRequest
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'email' => [
+                'required',
+                'string',
+                'lowercase',
+                'email',
+                'max:255',
+                Rule::unique(User::class)->ignore($this->user()->id),
+            ],
+            'avatar' => ['nullable', 'string', 'max:255', 'url'],
+        ];
+    }
+}

app/Http/Requests/Settings/TwoFactorAuthenticationRequest.php

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+<?php
+
+namespace App\Http\Requests\Settings;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Laravel\Fortify\Features;
+use Laravel\Fortify\InteractsWithTwoFactorState;
+
+class TwoFactorAuthenticationRequest extends FormRequest
+{
+    use InteractsWithTwoFactorState;
+
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return Features::enabled(Features::twoFactorAuthentication());
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [];
+    }
+}

app/Http/Requests/StoreCustomerRequest.php

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+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class StoreCustomerRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true; // Autorisierung später über Policies/Gates
+    }
+
+    public function rules(): array
+    {
+        return [
+            'type' => 'required|in:private,business',
+            'company_name' => [
+                'required_if:type,business',
+                'nullable',
+                'string',
+                'max:100',
+            ],
+            'first_name' => 'required|string|max:50',
+            'last_name' => 'required|string|max:50',
+            'email' => 'required|email|unique:customers,email|max:100',
+            'phone' => 'nullable|string|max:20',
+            'tax_number' => 'nullable|string|max:50',
+            'vat_id' => 'nullable|string|max:50',
+            'billing_address' => 'required|array',
+            'billing_address.street' => 'required|string|max:100',
+            'billing_address.city' => 'required|string|max:50',
+            'billing_address.postal_code' => 'required|string|max:10',
+            'billing_address.country' => 'required|string|size:2',
+            'payment_terms' => 'nullable|integer|min:1',
+            'status' => 'nullable|in:active,inactive,prospect',
+            'notes' => 'nullable|string',
+        ];
+    }
+}

app/Http/Requests/UpdateCustomerRequest.php

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+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateCustomerRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'type' => 'sometimes|in:private,business',
+            'company_name' => [
+                'sometimes',
+                'nullable',
+                'string',
+                'max:100',
+            ],
+            'first_name' => 'sometimes|string|max:50',
+            'last_name' => 'sometimes|string|max:50',
+            'email' => [
+                'sometimes',
+                'email',
+                'max:100',
+                Rule::unique('customers')->ignore($this->customer),
+            ],
+            'phone' => 'nullable|string|max:20',
+            'tax_number' => 'nullable|string|max:50',
+            'vat_id' => 'nullable|string|max:50',
+            'billing_address' => 'sometimes|array',
+            'billing_address.street' => 'required_with:billing_address|string|max:100',
+            'billing_address.city' => 'required_with:billing_address|string|max:50',
+            'billing_address.postal_code' => 'required_with:billing_address|string|max:10',
+            'billing_address.country' => 'required_with:billing_address|string|size:2',
+            'payment_terms' => 'nullable|integer|min:1',
+            'status' => 'nullable|in:active,inactive,prospect',
+            'notes' => 'nullable|string',
+        ];
+    }
+}