Add print cover fields and office profile

- Project settings gain siteAddress, workStage, projectLead and
  projectEditor (project.update-settings schema version 3, migration 0009);
  versions 2 and 1 stay executable and keep the current cover values.
  Snapshot schema 6 carries the fields; older versions upgrade with null.
- Global office profile (office name/address) next to the document logo:
  table document_branding_settings, PUT /api/document-branding/office,
  editable from the print view toolbar.
- Cover page reads all fields; empty values show the "[ergänzen]" marker.
  The Planstände editor column shows the project editor.
- Shared logo constants moved to a dependency-free module so the Next.js
  bundler can import them.

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

tests/document-branding.repository.test.ts

@@ -0,0 +1,77 @@
+import path from "node:path";
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import { createDatabaseContext } from "../src/db/database-context.js";
+import { DocumentBrandingRepository } from "../src/db/repositories/document-branding.repository.js";
+import { officeProfileFields } from "../src/shared/constants/project-cover.js";
+import { updateOfficeProfileSchema } from "../src/shared/validation/document-branding.schemas.js";
+
+function createRepository() {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  return { context, repository: new DocumentBrandingRepository(context.db) };
+}
+
+describe("document branding repository", () => {
+  it("stores, replaces and removes the office profile", () => {
+    const { context, repository } = createRepository();
+    try {
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: null,
+        officeAddress: null,
+      });
+      repository.setSettings(
+        updateOfficeProfileSchema.parse({
+          officeName: " kbp köhler beraten + planen GmbH ",
+          officeAddress: "Straße 1\n12345 Ort",
+        })
+      );
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: "kbp köhler beraten + planen GmbH",
+        officeAddress: "Straße 1\n12345 Ort",
+      });
+      repository.setSettings(
+        updateOfficeProfileSchema.parse({ officeName: "Büro", officeAddress: "" })
+      );
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: "Büro",
+        officeAddress: null,
+      });
+      assert.equal(
+        updateOfficeProfileSchema.safeParse({ officeName: "x".repeat(201), officeAddress: null })
+          .success,
+        false
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("replaces and deletes the logo", () => {
+    const { context, repository } = createRepository();
+    try {
+      repository.upsert({
+        key: "logo",
+        mimeType: "image/png",
+        fileName: "a.png",
+        data: Buffer.from([1, 2, 3]),
+      });
+      repository.upsert({
+        key: "logo",
+        mimeType: "image/svg+xml",
+        fileName: "b.svg",
+        data: Buffer.from("<svg/>"),
+      });
+      const logo = repository.get("logo");
+      assert.equal(logo?.mimeType, "image/svg+xml");
+      assert.equal(logo?.data.toString(), "<svg/>");
+      assert.equal(repository.delete("logo"), true);
+      assert.equal(repository.get("logo"), undefined);
+    } finally {
+      context.close();
+    }
+  });
+});