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/radialMenuElements.test.ts

@@ -1,13 +1,13 @@
 import { vi } from "vitest";
 
 // Mock BuildMenu to avoid importing lit and other ESM-heavy deps in this unit test
-vi.mock("../src/client/hud/layers/BuildMenu", () => ({
+vi.mock("client/hud/layers/BuildMenu", () => ({
   BuildMenu: class {},
   flattenedBuildTable: [],
 }));
 
 // Mock Utils to avoid touching DOM (document) during tests
-vi.mock("../src/client/Utils", () => ({
+vi.mock("client/Utils", () => ({
   translateText: (k: string) => k,
   getSvgAspectRatio: async () => 1,
 }));
@@ -16,7 +16,7 @@ import {
   COLORS,
   rootMenuElement,
   type MenuElementParams,
-} from "../src/client/hud/layers/RadialMenuElements";
+} from "client/hud/layers/RadialMenuElements";
 
 // Minimal stubs to satisfy types used in rootMenuElement.subMenu and allyBreak actions
 const makePlayer = (
@@ -31,7 +31,7 @@ const makePlayer = (
         : true,
     isTraitor: () => opts?.isTraitor ?? false,
     isDisconnected: () => opts?.isDisconnected ?? false,
-  }) as unknown as import("../src/core/game/GameView").PlayerView;
+  }) as unknown as import("client/view").PlayerView;
 
 const makeParams = (opts?: Partial<MenuElementParams>): MenuElementParams => {
   const myPlayer = (opts?.myPlayer as any) ?? makePlayer("p1");