add composer-unused, comprehensive docs, and project restructure

- Add icanhazstring/composer-unused as dev dependency for dependency hygiene checks
- Add German documentation (docs/) covering architecture, conventions, workflows, and developer checklists
- Add API layer (ApiAuth, ApiBootstrap, ApiResponse), audit, scheduler, custom fields, and SSO services
- Add Microsoft OIDC SSO, API token management, and user lifecycle features
- Add swagger-ui vendor integration and OpenAPI spec
- Add production Docker setup and bin/ scripts
- Update composer dependencies, config, templates, and frontend assets throughout

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

lib/Repository/Security/RateLimitRepository.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace MintyPHP\Repository\Security;
+
+use MintyPHP\DB;
+
+class RateLimitRepository
+{
+    public static function findByScopeAndHash(string $scope, string $subjectHash): ?array
+    {
+        $row = DB::selectOne(
+            'select id, scope, subject_hash, hits, window_started_at, blocked_until, created, modified from request_rate_limits where scope = ? and subject_hash = ? limit 1',
+            $scope,
+            $subjectHash
+        );
+        if (!$row || !isset($row['request_rate_limits']) || !is_array($row['request_rate_limits'])) {
+            return null;
+        }
+        return $row['request_rate_limits'];
+    }
+
+    public static function create(
+        string $scope,
+        string $subjectHash,
+        int $hits,
+        string $windowStartedAt,
+        ?string $blockedUntil
+    ): bool {
+        $result = DB::insert(
+            'insert into request_rate_limits (scope, subject_hash, hits, window_started_at, blocked_until, created) values (?,?,?,?,?,NOW())',
+            $scope,
+            $subjectHash,
+            (string) max(0, $hits),
+            $windowStartedAt,
+            $blockedUntil
+        );
+        return $result !== false;
+    }
+
+    public static function updateStateById(
+        int $id,
+        int $hits,
+        string $windowStartedAt,
+        ?string $blockedUntil
+    ): bool {
+        if ($id <= 0) {
+            return false;
+        }
+
+        $result = DB::update(
+            'update request_rate_limits set hits = ?, window_started_at = ?, blocked_until = ? where id = ?',
+            (string) max(0, $hits),
+            $windowStartedAt,
+            $blockedUntil,
+            (string) $id
+        );
+        return $result !== false;
+    }
+
+    public static function deleteByScopeAndHash(string $scope, string $subjectHash): bool
+    {
+        $result = DB::delete(
+            'delete from request_rate_limits where scope = ? and subject_hash = ?',
+            $scope,
+            $subjectHash
+        );
+        return $result !== false;
+    }
+}