Add CAdvowareAkten entity and related metadata

- Introduced new entity CAdvowareAkten with fields: name, description, createdAt, modifiedAt, assignedUser, teams, vmhRumungsklage, mietinkasso, aktenzeichen, and aktennummer.
- Defined relationships for CAdvowareAkten with existing entities: CVmhRumungsklage and CMietinkasso.
- Created client definitions, layouts, and ACL for CAdvowareAkten.
- Added internationalization support for CAdvowareAkten in multiple languages.
- Updated existing entities and metadata to include references to CAdvowareAkten.

custom/Espo/Custom/Resources/metadata/entityDefs/CMietinkasso.json

@@ -81,6 +81,9 @@
             "required": false,
             "default": 0,
             "isCustom": true
+        },
+        "advowareAkten": {
+            "type": "linkOne"
         }
     },
     "links": {
@@ -189,6 +192,12 @@
             "entity": "CPuls",
             "foreign": "parent",
             "isCustom": true
+        },
+        "advowareAkten": {
+            "type": "hasOne",
+            "foreign": "mietinkasso",
+            "entity": "CAdvowareAkten",
+            "isCustom": true
         }
     },
     "collection": {