Align store calls with selected-company scoping and add entity numbers.

Drop companyId from company-scoped store wrappers and routes, add GET /entity/next-number plus optional number on entity create/update, and document dashdbschema API.md lookup in sibling-repos.

docs/api/routes/entity/update.md

@@ -4,7 +4,9 @@ Protected. Requires a valid session cookie (`credentials: 'include'`).
 
 Update entity
 
-Patches `name` and/or `firstName`. Writes `entityhistory` when values change.
+Patches fields that are present (`name`, `firstName`, `number`).
+`number` is only changed when the key is present (no auto-allocate).
+Writes `entityhistory` when values change.
 
 
 ## Path parameters
@@ -18,7 +20,8 @@ Patches `name` and/or `firstName`. Writes `entityhistory` when values change.
 ```json
 {
   "name": "Müller",
-  "firstName": "Anna"
+  "firstName": "Anna",
+  "number": "10042"
 }
 ```
 
@@ -33,6 +36,7 @@ Updated entity
     "customergroupId": 1,
     "firstName": "…",
     "name": "…",
+    "number": "…",
     "createdAt": "2026-08-10T00:00:00.000Z",
     "updatedAt": "2026-08-10T00:00:00.000Z"
   }
@@ -43,10 +47,11 @@ Updated entity
 
 | Status | Description |
 |--------|-------------|
-| 400 | Name required, invalid id, or no company selected — `{"error":"…"}` |
+| 400 | Name/number required, invalid id, or no company selected — `{"error":"…"}` |
 | 401 | Unauthorized — `{"error":"…"}` |
 | 403 | Not authorized — `{"error":"…"}` |
 | 404 | Entity or company not found — `{"error":"…"}` |
+| 409 | Number already in use — `{"error":"…"}` |
 
 ---