[Feature Request] API to retrieve all ships from user dock and save to local file

[yltx]

Feature Request

Summary

Add a new API endpoint that retrieves all ships currently in the user's dock (ship hold/船舱) via OCR or game data parsing, and saves the result to a local JSON file.

Motivation

The GUI frontend (AutoWSGR-GUI) now supports fleet presets — users can define named fleet compositions (e.g. 传统AIII双装母: [飞龙, AIII, 鞍山, 长春, 大凤, 不挠]) in their plan YAML files. To provide a good user experience, the frontend needs to know which ships the user actually owns, so it can:

1. Validate fleet presets — highlight presets where one or more ships are missing from the user's dock
2. Guide fleet selection — only show presets that the user can actually form
3. Auto-complete ship names — provide suggestions when editing fleet compositions

Proposed API

GET /api/game/dock

Response:

{
  success: true,
  data: {
    ships: [
      { name: 飞龙, ship_type: cv, level: 110 },
      { name: AIII, ship_type: bbv, level: 105 },
      ...
    ],
    total: 500,
    saved_to: dock_ships.json
  }
}

Behavior

1. Navigate to the dock/ship hold screen in-game (or use existing game data if available without navigation)
2. Enumerate all ships the user owns (name, type, level at minimum)
3. Save the full list to a local JSON file (e.g. dock_ships.json in the autowsgr data directory)
4. Return the list in the API response

Notes

• This can be implemented using OCR on the dock screen, or by parsing game network data if the protocol supports it
• The saved file can be cached and reused by the frontend without re-calling the API each time
• Ship names should match the standard naming used in fleet fields (e.g. change_ships)
• Level and type information helps the frontend provide richer UI (e.g. sorting by level, filtering by type)