docs: add OpenAPI tag metadata for service documentation (#91)

Author: sallymoc

v2/api/archive-query-service/v2/query_services.proto

@@ -23,6 +23,18 @@ option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_swagger) = {
     description: "Github";
     url: "https://github.com/qubic/archive-query-service";
   }
+  tags: {
+    name: "ArchiveQueryService"
+    description: "Access historical Qubic blockchain data including transactions, ticks, and computor lists."
+    external_docs: {
+      description: "GitHub repository"
+      url: "https://github.com/qubic/archive-query-service/"
+    }
+    extensions: {
+      key: "x-displayName"
+      value: { string_value: "Query API" }
+    }
+  }
 };
 
 // Qubic Query API

v2/api/archive-query-service/v2/query_services.swagger.json

@@ -7,7 +7,13 @@
   },
   "tags": [
     {
-      "name": "ArchiveQueryService"
+      "name": "ArchiveQueryService",
+      "description": "Access historical Qubic blockchain data including transactions, ticks, and computor lists.",
+      "externalDocs": {
+        "description": "GitHub repository",
+        "url": "https://github.com/qubic/archive-query-service/"
+      },
+      "x-displayName": "Query API"
     }
   ],
   "host": "rpc.qubic.org",