feat: add 'caselaw' (פסיקה) kind alongside חוק/תקנות/חוזרים

Court rulings get their own kind so users can filter search results
to "פסיקה" specifically and upload case-law PDFs from the ניהול tab.
PHP validators in Controller + Service accept the new kind; the search
dropdown and upload kind dropdown gain a "פסיקה" option; kindHe in
index.js maps caselaw → "פסיקה" so jobs list, search results, and
browse view all label it consistently.

Backend: depends on shira-hermes commit 16eeeff (kind validators +
chunker fallback) and migration 003_caselaw_kind.sql (already applied
on dev — alters CHECK constraints on kb_source.kind and
kb_ingest_job.kind to include 'caselaw').

Refs Task Master #18

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

manifest.json

@@ -1,7 +1,7 @@
 {
     "name": "KnowledgeBase",
     "module": "KnowledgeBase",
-    "version": "0.4.0",
+    "version": "0.5.0",
     "acceptableVersions": [
         ">=8.0.0"
     ],