release(v1.8.0): feat(onlyoffice): first-class ONLYOFFICE integration (view/edit), admin UI, API, CSP helpers

Refs #37 — implements ONLYOFFICE integration suggested in the discussion; video progress saving will be tracked separately.

public/api/onlyoffice/config.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * @OA\Get(
+ *   path="/api/onlyoffice/config.php",
+ *   summary="Get editor config for a file (signed URLs, callback)",
+ *   tags={"ONLYOFFICE"},
+ *   @OA\Parameter(name="folder", in="query", @OA\Schema(type="string")),
+ *   @OA\Parameter(name="file",   in="query", @OA\Schema(type="string")),
+ *   @OA\Response(response=200, description="Editor config"),
+ *   @OA\Response(response=403, description="Forbidden"),
+ *   @OA\Response(response=404, description="Disabled / Not found")
+ * )
+ */
+declare(strict_types=1);
+require_once __DIR__ . '/../../../config/config.php';
+require_once PROJECT_ROOT . '/src/controllers/OnlyOfficeController.php';
+(new OnlyOfficeController())->config();