Add print view, board info card and document logo upload

- Seitenansicht (/projects/:projectId/print): tabular cover page, board
  overview with supply structure and power sums, one plan per board with a
  repeating title block; PDF via the browser print dialog with named @page
  rules (A4 portrait cover, A4/A3 landscape plans, page x of y).
- Distribution-board info card (board number, location, fed-from, remark)
  in the board edit dialog, persisted through the additively extended
  distribution-board.update command (migration 0008, snapshot schema 6,
  legacy subtree commands normalized).
- Global document logo upload (PNG/JPEG/SVG, max 2 MB) outside project
  revisions and snapshots.
- fed-from stays free text; the overview hierarchy and cumulated sums are
  preliminary until the feed link is modeled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/circuit-list-editor-known-limitations.md

@@ -27,3 +27,11 @@
 - Protection and cable values are planner-owned manual selections. The later
   sizing/warning engine does not yet validate them against load, length or
   voltage-drop rules.
+- Distribution-board `fedFrom` is free text. The print overview derives its
+  supply structure and "Σ inkl. unterlagert" only from exact text matches with
+  board numbers/names and adds values without an upstream simultaneity factor
+  (see `docs/print-view.md`).
+- The print view cover page shows placeholders for address, Leistungsphase and
+  office staff, and uses a provisional kbp corporate design. On screen, long
+  board plans are not split into pages; pagination happens in the browser print
+  dialog.