refactor(api): buses only in services, atomic commands, @Prop schemas

- Mongo read models are @Schema/@Prop classes (SchemaFactory), still
  loose: the props declared are the indexed or shaped ones.
- CommandBus and QueryBus are used by the application services alone.
  Duplicating a ticket, bulk updates, CSV imports, proposals and
  emptying the trash chain several commands, so they are service
  methods now and their composite commands are gone; every command
  handler is atomic. No forwardRef is needed.
- The due-date and trash timers are entry points: they live in the
  presenters and call the services. The automations event handler has
  its own file and calls AutomationsService.
- The tracker's user directory asks IdentityService; the composition
  root hands the identity application module to the tracker
  infrastructure (withIdentity), with no global module.

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

libs/api/tracker/application/src/lib/commands/command-handlers.ts

@@ -1,7 +1,5 @@
-import { DuplicateIssueCommandHandler } from './duplicate-issue.command-handler';
 import { ReactToCommentCommandHandler } from './react-to-comment.command-handler';
 import { VoteIssueCommandHandler } from './vote-issue.command-handler';
-import { SubmitProposalCommandHandler } from './submit-proposal.command-handler';
 import { CreateProjectCommandHandler } from './create-project.command-handler';
 import { UpdateProjectCommandHandler } from './update-project.command-handler';
 import { UpdateProjectSettingsCommandHandler } from './update-project-settings.command-handler';
@@ -36,7 +34,6 @@ import { SetIssueParentCommandHandler } from './set-issue-parent.command-handler
 import { RankIssueCommandHandler } from './rank-issue.command-handler';
 import { WriteReleaseNotesCommandHandler } from './write-release-notes.command-handler';
 import { SPRINT_COMMAND_HANDLERS } from './sprint.command-handlers';
-import { BulkUpdateIssuesCommandHandler } from './bulk-update-issues';
 import { TRASH_HANDLERS } from './trash';
 import { DetachFromParentCommandHandler } from './detach-from-parent.command-handler';
 import {
@@ -46,10 +43,8 @@ import {
 } from './change-checklist.command-handler';
 
 export const COMMAND_HANDLERS = [
-  SubmitProposalCommandHandler,
   VoteIssueCommandHandler,
   ReactToCommentCommandHandler,
-  DuplicateIssueCommandHandler,
   CreateProjectCommandHandler,
   UpdateProjectCommandHandler,
   UpdateProjectSettingsCommandHandler,
@@ -85,7 +80,6 @@ export const COMMAND_HANDLERS = [
   RankIssueCommandHandler,
   WriteReleaseNotesCommandHandler,
   ...SPRINT_COMMAND_HANDLERS,
-  BulkUpdateIssuesCommandHandler,
   ...TRASH_HANDLERS,
   AddChecklistItemCommandHandler,
   UpdateChecklistItemCommandHandler,