RustyCMS: File-based headless CMS with REST API, admin UI, multilingual support

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+# Store backend: file | sqlite (default: file)
+RUSTYCMS_STORE=file
+
+# Multilingual: comma-separated locales (e.g. de,en). First = default. Content under content/{locale}/{collection}/.
+RUSTYCMS_LOCALES=de,en
+
+# Only when RUSTYCMS_STORE=sqlite: SQLite URL (default: sqlite:content.db)
+# RUSTYCMS_DATABASE_URL=sqlite:content.db
+
+# API key for write access (POST/PUT/DELETE + POST /api/schemas). GET stays without key.
+# Authorization: Bearer <key> or X-API-Key: <key>. For Admin UI in browser: set same value in admin-ui as NEXT_PUBLIC_RUSTYCMS_API_KEY.
+RUSTYCMS_API_KEY=dein-geheimes-token
+
+# Optional: CORS – allowed origin (e.g. https://my-frontend.com). Empty or * = allow all.
+# RUSTYCMS_CORS_ORIGIN=
+
+# Optional: Response cache for GET /api/content (TTL in seconds). 0 = off. Default: 60.
+# RUSTYCMS_CACHE_TTL_SECS=60