test(share): cover alias controllers; address PR #214 review

Add the two blocking test-coverage specs requested in the PR #214 review and
clear the cheap non-blocking items.

Must-fix:
- share-alias-redirect.controller.spec.ts: routing/leak guard for the public
  GET /l/:alias resolver (modeled on share-seo.controller.routing.spec). Pins
  302-to-canonical on a hit; SPA index without a 302 for unknown/dangling/
  unreadable aliases and a null workspace (no name-existence leak); defensive
  percent-decoding treated as unknown; self-hosted findFirst vs subdomain
  findByHostname workspace resolution; 404 when no built client index exists.
- share-alias.controller.spec.ts: authz gates with mocked PageRepo/ShareService/
  ShareAliasService/PageAccessService. Covers cross-workspace/nonexistent page
  -> NotFoundException, validateCanEdit, resolveReadableSharePage null ->
  BadRequestException, isSharingAllowed false -> ForbiddenException, set happy
  path delegation, remove() of a dangling alias (pageId null) skipping
  validateCanEdit but still deleting, and for-page validateCanView.

Cheap review items:
- Remove dead Logger import/field from ShareAliasRedirectController.
- Remove dead PagePermissionRepo import/dependency from ShareAliasController.
- Register the new share-alias UI strings in en-US and ru-RU catalogs.
- Add an [Unreleased]/Added CHANGELOG entry for /l/:alias (#205).
- Drop the tautological boilerplate assertions from the migration spec
  (exports up/down; runtime checks of typed entity literals).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/core/share/share-alias.controller.ts

@@ -14,7 +14,6 @@ import { AuthUser } from '../../common/decorators/auth-user.decorator';
 import { AuthWorkspace } from '../../common/decorators/auth-workspace.decorator';
 import { User, Workspace } from '@docmost/db/types/entity.types';
 import { PageRepo } from '@docmost/db/repos/page/page.repo';
-import { PagePermissionRepo } from '@docmost/db/repos/page/page-permission.repo';
 import { PageAccessService } from '../page/page-access/page-access.service';
 import { ShareService } from './share.service';
 import { ShareAliasService } from './share-alias.service';
@@ -37,7 +36,6 @@ export class ShareAliasController {
     private readonly shareAliasService: ShareAliasService,
     private readonly shareService: ShareService,
     private readonly pageRepo: PageRepo,
-    private readonly pagePermissionRepo: PagePermissionRepo,
     private readonly pageAccessService: PageAccessService,
   ) {}