Add configurable distribution supply types

docs/circuit-list-editor-api.md

@@ -145,11 +145,14 @@ synchronizes linked circuit rows implicitly.
 
 - `PUT /projects/:projectId`
   - request:
-    `{ "expectedRevision": 12, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400 }`
+    `{ "expectedRevision": 12, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
   - executes `project.update-settings` as one atomic revision
   - response:
     `{ "project": { ... }, "revision": { ... }, "history": { ... } }`
-  - persistent Undo/Redo restores both voltage values together
+  - persistent Undo/Redo restores metadata, voltage values and the enabled
+    distribution-board supply types together
+  - at least one of `AV`, `SV`, `EV`, `USV`, `MSR`, `SiBe` must be enabled;
+    a supply type currently used by a distribution board cannot be disabled
   - unchanged values are rejected without creating a revision; a stale
     revision returns `409 PROJECT_REVISION_CONFLICT`
 
@@ -181,7 +184,11 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
 ### Distribution Board Setup
 
 - `POST /projects/:projectId/distribution-boards`
-  - body: `{ "name": "UV-02", "expectedRevision": 12 }`
+  - body:
+    `{ "name": "UV-02", "floorId": "floor_1", "supplyType": "SV", "expectedRevision": 12 }`
+  - `floorId` may be `null`; a non-null floor must belong to the project
+  - `supplyType` is one of `AV`, `SV`, `EV`, `USV`, `MSR` or `SiBe` and must
+    be enabled in the project settings
   - executes `distribution-board.insert` with stable ids for the distribution
     board, its circuit list and all four default circuit sections
   - response:
@@ -189,6 +196,11 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
   - persistent Undo removes only the unchanged and still-empty generated
     structure; Redo restores the same ids
   - stale revisions return `409 PROJECT_REVISION_CONFLICT`
+- `PUT /projects/:projectId/distribution-boards/:distributionBoardId`
+  - body:
+    `{ "floorId": null, "supplyType": "AV", "expectedRevision": 13 }`
+  - executes `distribution-board.update`; floor and supply type are restored
+    together by persistent Undo/Redo
 
 ### Project Floors and Rooms
 
@@ -203,8 +215,9 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
     and must belong to the project when present
   - response: `{ "room": { ... }, "revision": { ... }, "history": { ... } }`
 - Persistent Undo removes only unchanged, unreferenced records. A floor with
-  assigned rooms and a room referenced by device rows or retained upgrade data
-  are rejected instead of silently clearing foreign keys.
+  assigned rooms or distribution boards and a room referenced by device rows
+  or retained upgrade data are rejected instead of silently clearing foreign
+  keys.
 - Stale revisions return `409 PROJECT_REVISION_CONFLICT`.
 
 ### Tree Endpoint