refactor: convert to npm-workspaces monorepo (engine/core-public/shared/client/server)

Restructure the single src/ tree into an npm-workspaces monorepo under
packages/, rename core -> engine, extract a types-only core-public layer,
and break the pre-existing engine -> client dependency cycle.

Structure (packages/):
  core-public  public API/wire schemas + shared enums (clean leaf)
  shared       framework-agnostic helpers (clean leaf)
  engine       deterministic simulation (was src/core)
  client       rendering/UI (was src/client)
  server       coordination (was src/server)

Dependency DAG: engine -> {core-public, shared}; client -> {core-public,
shared, engine}; server -> {core-public, engine}.

- npm workspaces: root package.json workspaces + per-package package.json;
  tsconfig.base.json holds shared options + path aliases
  (core-public/* shared/* engine/* client/* server/*) resolved uniformly by
  tsc, Vite (resolve.tsconfigPaths), Vitest, and tsx. Lockfile regenerated.
- core-public: moved Schemas/ApiSchemas/CosmeticSchemas/StatsSchemas/
  ClanApiSchemas/WorkerSchemas/Base64/PatternDecoder; extracted the enums
  (GameTypes), GameEvent type, emoji table, and GraphicsOverrides schema.
  Engine re-exports the moved enums/types so existing imports keep working.
- Broke engine -> client cycle:
  - renderNumber/renderTroops -> shared/format
  - NameBoxCalculator moved into engine
  - username validation returns translation key + params; client translates
  - applyStateUpdate moved to client (operates on the render-only PlayerState)
  - Config/UnitGrid/execution-Util/GameImpl now use structural read
    interfaces (engine/game/ReadViews: PlayerLike/UnitLike/GameLike) instead
    of importing client view classes; client imports view classes from a new
    client/view barrel; deleted the engine/game/GameView re-export shim.
- Build/deploy updated: vite.config, index.html, eslint, Dockerfile
  (copies packages/ + tsconfig.base.json before npm ci), .vscode, tests.

Verified: tsc --noEmit clean; 1364 + 65 tests pass; production vite build
succeeds; engine has zero client/server imports; core-public and shared are
dependency leaves.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/pathfinding/utils.ts

@@ -9,25 +9,25 @@ import {
   GameMode,
   GameType,
   PlayerInfo,
-} from "../../src/core/game/Game";
-import { createGame, GameImpl } from "../../src/core/game/GameImpl";
-import { TileRef } from "../../src/core/game/GameMap";
+} from "engine/game/Game";
+import { createGame, GameImpl } from "engine/game/GameImpl";
+import { TileRef } from "engine/game/GameMap";
 import {
   genTerrainFromBin,
   MapManifest,
-} from "../../src/core/game/TerrainMapLoader";
-import { UserSettings } from "../../src/core/game/UserSettings";
-import { AStarWater } from "../../src/core/pathfinding/algorithms/AStar.Water";
-import { AStarWaterHierarchical } from "../../src/core/pathfinding/algorithms/AStar.WaterHierarchical";
-import { PathFinding } from "../../src/core/pathfinding/PathFinder";
-import { PathFinderBuilder } from "../../src/core/pathfinding/PathFinderBuilder";
-import { StepperConfig } from "../../src/core/pathfinding/PathFinderStepper";
-import { MiniMapTransformer } from "../../src/core/pathfinding/transformers/MiniMapTransformer";
+} from "engine/game/TerrainMapLoader";
+import { UserSettings } from "engine/game/UserSettings";
+import { AStarWater } from "engine/pathfinding/algorithms/AStar.Water";
+import { AStarWaterHierarchical } from "engine/pathfinding/algorithms/AStar.WaterHierarchical";
+import { PathFinding } from "engine/pathfinding/PathFinder";
+import { PathFinderBuilder } from "engine/pathfinding/PathFinderBuilder";
+import { StepperConfig } from "engine/pathfinding/PathFinderStepper";
+import { MiniMapTransformer } from "engine/pathfinding/transformers/MiniMapTransformer";
 import {
   PathStatus,
   SteppingPathFinder,
-} from "../../src/core/pathfinding/types";
-import { GameConfig } from "../../src/core/Schemas";
+} from "engine/pathfinding/types";
+import { GameConfig } from "core-public/Schemas";
 import { TestConfig } from "../util/TestConfig";
 
 export type BenchmarkRoute = {