admi api: remove info about local node from GetClusterStatus and add specific GetNodeInfo endpoint

doc/api/garage-admin-v2.yml

@@ -84,34 +84,12 @@ paths:
             application/json:
               schema:
                 type: object
-                required: [ node, garageVersion, garageFeatures, rustVersion, dbEngine, knownNodes, layout ]
+                required: [ layoutVersion, nodes ]
                 properties:
-                  node: 
-                    type: string
-                    example: "ec79480e0ce52ae26fd00c9da684e4fa56658d9c64cdcecb094e936de0bfe71f"
-                  garageVersion:
-                    type: string
-                    example: "v2.0.0"
-                  garageFeatures:
-                    type: array
-                    items:
-                      type: string
-                    example:
-                      - "k2v"
-                      - "lmdb"
-                      - "sqlite"
-                      - "consul-discovery"
-                      - "kubernetes-discovery"
-                      - "metrics"
-                      - "telemetry-otlp"
-                      -  "bundled-libs"
-                  rustVersion:
-                    type: string
-                    example: "1.68.0"
-                  dbEngine:
-                    type: string
-                    example: "LMDB (using Heed crate)"
-                  knownNodes:
+                  layoutVersion:
+                    type: integer
+                    example: 1
+                  nodes:
                     type: array
                     example:
                       - id: "ec79480e0ce52ae26fd00c9da684e4fa56658d9c64cdcecb094e936de0bfe71f"
@@ -131,8 +109,6 @@ paths:
                         hostname: neptune
                     items:
                       $ref: '#/components/schemas/NodeNetworkInfo'
-                  layout:
-                    $ref: '#/components/schemas/ClusterLayout'
                           
   /ConnectClusterNodes:
     post: