feat: Phase 2 — document upload from KB UI

Adds a "ניהול" tab with multipart file upload, async job tracking, and
a recent-jobs list with live status polling. Browser POSTs to
/KnowledgeBase/action/upload (PHP proxy), which forwards as multipart
to shira-hermes /admin/kb/upload. shira-hermes returns a job_id
immediately and processes parse/chunk/embed in a background task; the
browser polls every 2s until status hits done|failed.

New EspoCRM endpoints:
  POST /KnowledgeBase/action/upload   (multipart, $_FILES['file'])
  GET  /KnowledgeBase/action/jobs     (list, filtered by topicId/status)
  GET  /KnowledgeBase/action/job?id   (single-job detail)

The X-User-Name header is forwarded so kb_ingest_job records who
uploaded each file. Cross-topic guard in switchTopic stops polling
when the user changes topics mid-upload (the job continues server-side).

Depends on shira-hermes commit 0cb89fb (admin upload endpoints +
migration 002).

Refs Task Master #13

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

manifest.json

@@ -1,7 +1,7 @@
 {
     "name": "KnowledgeBase",
     "module": "KnowledgeBase",
-    "version": "0.3.0",
+    "version": "0.4.0",
     "acceptableVersions": [
         ">=8.0.0"
     ],