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-api.md

@@ -230,9 +230,13 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
   - stale revisions return `409 PROJECT_REVISION_CONFLICT`
 - `PUT /projects/:projectId/distribution-boards/:distributionBoardId`
   - body:
-    `{ "floorId": null, "supplyType": "AV", "expectedRevision": 13 }`
-  - executes `distribution-board.update`; floor and supply type are restored
-    together by persistent Undo/Redo
+    `{ "floorId": null, "supplyType": "AV", "simultaneityFactor": 1, "expectedRevision": 13 }`
+  - optional info-card fields: `boardNumber` (max. 50), `location`,
+    `fedFrom` (max. 200 each) and `remark` (max. 2000); strings are trimmed
+    and an empty string is stored as `null`
+  - executes `distribution-board.update`; all submitted values, including the
+    submitted info fields, are restored together by persistent Undo/Redo
+  - `fedFrom` is free text until the logical feed link is modeled
 - `POST /projects/:projectId/distribution-boards/:distributionBoardId/copy`
   - body: `{ "name": "UV-02 Kopie", "expectedRevision": 14 }`
   - duplicates the complete distribution-board subtree with new owning UUIDs