Adds onion map

[TKTK123456]

If this PR fixes an issue, link it below. If not, delete these two lines.
Resolves #4055

Description:

Adds a 512*512 onion map with 3 nations (Leafer Confederation, Outer Enclave and Inner Tribe)

Please complete the following:

• I have added screenshots for all UI updates
• I process any text displayed to the user through translateText() and I've added it to the en.json file
• I have added relevant tests to the test directory
• I confirm I have thoroughly tested these changes and take full responsibility for any bugs introduced

Please put your Discord username so you can be contacted if a bug or regression is found:

tktk1234567

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 11fec6c0-783d-4ac6-b34d-ffd878678c2b

📥 Commits

Reviewing files that changed from the base of the PR and between 00b5723 and 3edfeac.

📒 Files selected for processing (1)

• resources/lang/en.json

✅ Files skipped from review due to trivial changes (1)

• resources/lang/en.json

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Walkthrough

Adds the "Onion" map end-to-end: two JSON map assets (info and manifest), registers "onion" in the map-generator, exposes GameMapType.Onion and adds it to mapCategories.arcade, and sets playlist FREQUENCY["Onion"] = 2.

Changes

Onion Map Addition

Layer / File(s)	Summary
Map configuration and definition map-generator/assets/maps/onion/info.json, resources/maps/onion/manifest.json	info.json defines name: "onion" and three nations (Leafer Confederation, Outer Enclave, Inner Tribe) with coordinates and empty flag. manifest.json lists base, map16x, and map4x layers with dimensions/tiles and repeats the three nations with names and coordinates.
Generator registry update map-generator/main.go	Adds "onion" to the maps registry so the generator will process the new map and locate its assets.
Game enum, category, and playlist frequency src/core/game/Game.ts, src/server/MapPlaylist.ts	Adds GameMapType.Onion, includes it in mapCategories.arcade, and adds Onion: 2 to the playlist FREQUENCY table.
Localization resources/lang/en.json	Adds map.onion = "Onion" and confirms map.balkans in the English locale.

Sequence Diagram

sequenceDiagram
  participant MapGenerator
  participant MapsRegistry
  participant MapAssets
  participant GameCore
  participant PlaylistService
  MapGenerator->>MapsRegistry: register "onion"
  MapsRegistry->>MapAssets: load info.json & manifest.json
  GameCore->>MapsRegistry: reference GameMapType.Onion
  GameCore->>PlaylistService: include "Onion" via mapCategories
  PlaylistService->>PlaylistService: set FREQUENCY["Onion"] = 2

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• Onion Map #3974: Appears to add the same "Onion" map and touches matching registration and asset points.

Possibly related PRs

• openfrontio/OpenFrontIO#3920: Similar end-to-end map addition pattern (registry, Game enum, playlist).
• openfrontio/OpenFrontIO#3977: Wires a new selectable map through the same integration points.
• openfrontio/OpenFrontIO#4002: Adds map content and updates GameMapType/mapCategories and playlist frequency similarly.

Suggested reviewers

• evanpelle
• RickD004

Poem

🧅 Onion map now takes the stage,
Three nations ring the layered page.
Registry whispers its new name,
Game and playlists call its game,
Players soon will taste its sage.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Adds onion map' directly summarizes the main change—a new map is being added to the system.
Description check	✅ Passed	The description explains the new map addition with specific details: 512×512 size, three nations, and a visual thumbnail. It relates directly to the changeset.
Linked Issues check	✅ Passed	All coding requirements from #4055 are met: the onion map is added for Singleplayer/Custom lobbies [#4055], included in the lobby rotation [#4055], and contains the correct specifications (512×512, 3 nations) [#4055].
Out of Scope Changes check	✅ Passed	All changes are in scope: map data files (info.json, manifest.json), game type definitions, map playlist weighting, and localization strings directly support the objective of adding the onion map.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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