Replace bracket detail page with /jobs?bracket_id= filter

- Bracket names in the list now link directly to /jobs?bracket_id=X
- /brackets/{id} redirects to /jobs?bracket_id=X (keeps old links working)
- Bracket link on job detail page updated accordingly
- bracket_detail.html and add_jobs_to_bracket route removed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/templates/job_detail.html

@@ -41,7 +41,7 @@
             <tr><td class="text-secondary">Printer</td>
                 <td>{{ job.printer.name if job.printer else '—' }}</td></tr>
             <tr><td class="text-secondary">Bracket</td>
-                <td>{% if job.bracket %}<a href="/brackets/{{ job.bracket.id }}" class="text-white">{{ job.bracket.name }}</a>{% else %}—{% endif %}</td></tr>
+                <td>{% if job.bracket %}<a href="/jobs?bracket_id={{ job.bracket.id }}" class="text-white">{{ job.bracket.name }}</a>{% else %}—{% endif %}</td></tr>
             <tr><td class="text-secondary">Created</td>
                 <td>{{ job.created_at.strftime('%d.%m.%Y %H:%M') }}</td></tr>
             {% if job.started_at %}