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>

src/db/migrations/meta/_journal.json

@@ -50,6 +50,13 @@
       "when": 1786043080323,
       "tag": "0006_damp_skrulls",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "6",
+      "when": 1790411540872,
+      "tag": "0007_board_info_and_document_logo",
+      "breakpoints": true
     }
   ]
 }