Rebrand Pinscope to Periscope across product and codebase.

Rename the core package to periscopex, update UI/docs/Docker/deploy defaults to periscope.michelebigi.it, and keep legacy version/storage key aliases so existing projects keep working.

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

backend/services/datasheet_store.py

@@ -16,7 +16,7 @@ from __future__ import annotations
 import hashlib
 from pathlib import Path
 
-from backend.pinscopex.utils import safe_mpn
+from backend.periscopex.utils import safe_mpn
 from backend.services.storage import StorageBackend
 
 BLOB_PREFIX = "library/datasheets/blobs/"