Finanzverwaltung und Saison-System

Neues Einnahmen-/Ausgaben-Modul mit Kategorie-Filter, Monats-Charts und
Saison-basierter Filterung. Saison-Verwaltung im Admin-Bereich mit
Möglichkeit zum Wechsel der aktuellen Saison.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/0039_01_01_000001_create_finances_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('finances', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('team_id')->nullable()->constrained()->nullOnDelete();
+            $table->string('type', 10);
+            $table->string('category', 30);
+            $table->string('title', 150);
+            $table->integer('amount');
+            $table->date('date');
+            $table->text('notes')->nullable();
+            $table->foreignId('created_by')->constrained('users');
+            $table->timestamps();
+
+            $table->index(['team_id', 'date']);
+            $table->index(['type', 'date']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('finances');
+    }
+};