feat: Phase 3 — sources management table in 'ניהול' tab

Adds full CRUD for KB sources from the EspoCRM UI: a sortable table at
the top of the 'ניהול' tab with kind / title-identifier-updated / chunk
count / actions columns, a kind filter (חוק / תקנות / חוזרים / פסיקה),
and three per-row actions:

  ✏ Edit       — inline form with title, identifier, dates, source URL
  ↻ Reingest   — re-parses the original file in place, replacing chunks
                 while keeping the source row + hand-edited metadata
  🗑 Delete    — confirm dialog with chunk count; double confirm above
                 100 chunks; also deletes the MinIO object

Browser polls the standard /KnowledgeBase/action/job endpoint for
re-ingest progress (same banner as upload). On terminal status
(done|failed) the sources table auto-refreshes so chunk_count and
last_ingest reflect the new state. Topic switch invalidates the
per-topic admin-sources cache so a stale list doesn't bleed across
topics.

Backend: depends on shira-hermes commit 17f93b5
(GET/PUT/DELETE /admin/kb/sources + POST /reingest).

Refs Task Master #14

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

manifest.json

@@ -1,7 +1,7 @@
 {
     "name": "KnowledgeBase",
     "module": "KnowledgeBase",
-    "version": "0.5.0",
+    "version": "0.6.0",
     "acceptableVersions": [
         ">=8.0.0"
     ],