feat: initial SmartAssistant module — unified AI assistant with case memory

Merges CrmAssistant + OfficeAssistant into a single module with:
- Floating chat (FAB) with auto office/case mode detection
- CaseMemory entity for persistent per-case knowledge
- save_memory AI tool for proactive memory saving
- Auto-extraction hooks (status changes, hearings)
- AlertCalculator for office-level alerts
- Full conversation persistence via ConversationRepository
- RTL/Hebrew support throughout (fa_IR)

47 files, 0 dependencies on old modules.

manifest.json

@@ -0,0 +1,10 @@
+{
+    "name": "Smart Assistant",
+    "module": "SmartAssistant",
+    "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and n8n integration",
+    "author": "klear",
+    "version": "1.0.0",
+    "acceptableVersions": [">=8.0.0"],
+    "releaseDate": "2026-03-23",
+    "php": [">=8.1"]
+}