feat: SmartAssistant v2.3.0 — document tools + NetworkStorage integration

- Add upload_document, generate_document, merge_documents tools
- Rewrite DocumentAnalyzer to use NetworkStorageIntegration instead of custom WebDAV client
- Delete FileStorage classes (FileStorageInterface, FileStorageFactory, NextCloudFileStorage, WebDavFileStorage)
- Use networkStorageFolderPath instead of nextCloudFolderPath

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

manifest.json

@@ -3,11 +3,11 @@
     "module": "SmartAssistant",
     "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and AI Gateway integration",
     "author": "klear",
-    "version": "2.2.0",
+    "version": "2.3.0",
     "acceptableVersions": [
         ">=8.0.0"
     ],
-    "releaseDate": "2026-04-04",
+    "releaseDate": "2026-04-05",
     "php": [
         ">=8.1"
     ]