fix(2.10.3): expose AssistantRule + CaseMemory in Admin Layout Manager

Two metadata gaps spotted when the user couldn't see Shira entities in
Admin → Layout Manager and got console 404s on /#CaseMemory:

* AssistantRule.json (scopes/) was missing `customizable: true` and
  `importable: false`. Without `customizable: true` EspoCRM hides the
  entity from Admin → Entity Manager → Layouts. Other Shira entities
  already had it; this one was the outlier.

* CaseMemory.json (clientDefs/) didn't exist at all. The Metadata
  endpoint returned an empty object, so the frontend fell through to
  default convention `client/custom/modules/smart-assistant/src/controllers/case-memory.js`
  which doesn't exist → 404 in browser console. Adding clientDefs with
  `controller: controllers/record` + icon + filters lets the standard
  record controller handle the entity without any custom JS file.

Verified on prod after hot-patch:
- Metadata?key=scopes.AssistantRule.customizable → "true"
- Metadata?key=clientDefs.CaseMemory → full object

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

manifest.json

@@ -3,7 +3,7 @@
     "module": "SmartAssistant",
     "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and AI Gateway integration",
     "author": "klear",
-    "version": "2.10.2",
+    "version": "2.10.3",
     "acceptableVersions": [
         ">=8.0.0"
     ],