Add: completion and downloaded volumes statistics

[dnzbk]

Description

• added a new "Statistics" page to display completion and download volume analytics for news-servers.
• the API method "resetservervolumes" now allows for selective resetting of counters. Arguments:
  • ServerId (int) - Server ID to reset.
  • Counter (string) - Specifies which counter to reset. The behavior depends on the value of this argument:
    • "CUSTOM" (case-sensitive) - Resets only the custom counter associated with the server. Use this option to clear custom statistics while preserving overall download volume data.
    • "" (empty string) - Resets all counters associated with the server, including the overall download volume and any custom counters.
• the API method "servervolumes" now returns 2 additional properties:
  • CountersResetTime (int) - Date/time of the last reset of all counters (time is in C/Unix format).
  • ArticlesPerDays (struct[]) - Per-day amount of failed and success articles since program installation. Contains an array of structs with following fields:
    • Failed (int) - Amount of failed articles.
    • Success (int) - Amount of success articles.

Testing

• Windows 7 / Firefox 115
• Windows 11 / Chrome 135
• macOS 13 / Chrome 135, Safari 18

[luckedea]

lgtm