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/periscopex/utils.py

@@ -0,0 +1,21 @@
+"""Shared utility functions for the periscopex core library."""
+
+from __future__ import annotations
+
+import re
+
+
+def safe_mpn(mpn: str) -> str:
+    """Sanitize an MPN string for use in filenames and storage keys."""
+    return mpn.replace("/", "_").replace(":", "_")
+
+
+def natural_sort_key(s: str) -> tuple:
+    """Sort key for natural ordering: R1, R2, R10 (not R1, R10, R2)."""
+    parts: list[int | str] = []
+    for chunk in re.split(r"(\d+)", s):
+        if chunk.isdigit():
+            parts.append(int(chunk))
+        else:
+            parts.append(chunk.lower())
+    return tuple(parts)