fix: add version field to /api/v1/server response

Include globals.Version in the server info JSON response and update
README documentation to reflect the new field.

README.md

@@ -1362,16 +1362,18 @@ Return server metadata. No authentication required.
 ```json
 {
   "name": "My NeoIRC Server",
+  "version": "0.1.0",
   "motd": "Welcome! Be nice.",
   "users": 42
 }
 ```
 
-| Field   | Type    | Description |
-|---------|---------|-------------|
-| `name`  | string  | Server display name |
-| `motd`  | string  | Message of the day |
-| `users` | integer | Number of currently active user sessions |
+| Field     | Type    | Description |
+|-----------|---------|-------------|
+| `name`    | string  | Server display name |
+| `version` | string  | Server version |
+| `motd`    | string  | Message of the day |
+| `users`   | integer | Number of currently active user sessions |
 
 ### GET /.well-known/healthcheck.json — Health Check
 

internal/handlers/api.go

@@ -2336,9 +2336,10 @@ func (hdlr *Handlers) HandleServerInfo() http.HandlerFunc {
 		}
 
 		hdlr.respondJSON(writer, request, map[string]any{
-			"name":  hdlr.params.Config.ServerName,
-			"motd":  hdlr.params.Config.MOTD,
-			"users": users,
+			"name":    hdlr.params.Config.ServerName,
+			"version": hdlr.params.Globals.Version,
+			"motd":    hdlr.params.Config.MOTD,
+			"users":   users,
 		}, http.StatusOK)
 	}
 }