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>

tests/test_derating.py

@@ -7,11 +7,11 @@ C0G is not treated as X7R.
 
 from __future__ import annotations
 
-from backend.pinscopex.derating import (
+from backend.periscopex.derating import (
     build_derating_table,
     dc_bias_remaining,
 )
-from backend.pinscopex.models import (
+from backend.periscopex.models import (
     CapacitorSpecs,
     Component,
     ComponentType,