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/shared/validation/project-structure.schemas.ts

@@ -1,5 +1,9 @@
 import { z } from "zod";
-import { distributionBoardSupplyTypes } from "../constants/distribution-board.js";
+import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
+} from "../constants/distribution-board.js";
 import { expectedProjectRevisionSchema } from "./project-command.schemas.js";
 
 export const createProjectSchema = z.object({
@@ -42,12 +46,27 @@ export const createDistributionBoardSchema = z
   })
   .strict();
 
+// Empty info text is stored as null so that "not entered" has one
+// representation in the database, snapshots and print view.
+const distributionBoardInfoValueSchema = (field: DistributionBoardInfoField) =>
+  z
+    .string()
+    .trim()
+    .max(distributionBoardInfoFieldMaxLengths[field])
+    .nullable()
+    .transform((value) => (value ? value : null))
+    .optional();
+
 export const updateDistributionBoardSchema = z
   .object({
     expectedRevision: expectedProjectRevisionSchema,
     floorId: z.string().trim().min(1).nullable(),
     supplyType: z.enum(distributionBoardSupplyTypes),
     simultaneityFactor: z.number().finite().min(0).max(1),
+    boardNumber: distributionBoardInfoValueSchema("boardNumber"),
+    location: distributionBoardInfoValueSchema("location"),
+    fedFrom: distributionBoardInfoValueSchema("fedFrom"),
+    remark: distributionBoardInfoValueSchema("remark"),
   })
   .strict();