refactor: collapse per-env Configs into ClientEnv + ServerEnv (#3906)

## Description:

This is a refactor to simplify config handling.

Replaces the per-environment DevConfig/PreprodConfig/ProdConfig class
hierarchy with two static classes: ClientEnv (browser main thread, reads
from window.BOOTSTRAP_CONFIG) and ServerEnv (Node server, reads from
process.env). The four config classes are deleted, the abstract
DefaultServerConfig is gone, and DefaultConfig is renamed to Config.

The values that flow server → client (gameEnv, numWorkers,
turnstileSiteKey, jwtAudience, instanceId) used to be baked into the
hardcoded per-env classes. They're now real env vars on the server,
embedded into a single window.BOOTSTRAP_CONFIG object in index.html at
request time (alongside the existing gitCommit/assetManifest/cdnBase
globals, which moved into the same object), and read back by ClientEnv
on the client. The dev defaults previously hidden inside DevServerConfig
are now explicit in start:server-dev (NUM_WORKERS=2,
TURNSTILE_SITE_KEY=1x..., JWT_AUDIENCE=localhost, etc.) and in
vite.config.ts's html plugin inject.data. Production deploys plumb
NUM_WORKERS and TURNSTILE_SITE_KEY through deploy.yml (GitHub vars) into
the remote env file; JWT_AUDIENCE is derived from DOMAIN in deploy.sh.
The dynamic /api/instance endpoint is gone — INSTANCE_ID rides along in
BOOTSTRAP_CONFIG now.

ServerEnv is the only thing server code touches; ClientEnv is
browser-only. The two classes have intentional overlap (env, numWorkers,
jwtIssuer, gameCreationRate, workerIndex, etc.) since they derive
identical logic from different sources — there's a TODO in each to
consolidate via a shared helper later. The game-logic Config no longer
stores a ServerConfig/ClientEnv reference and its serverConfig() getter
is gone; the one caller (MultiTabModal) now reads ClientEnv.env()
directly. Worker init no longer carries server-config values since
nothing in the worker actually reads them.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] 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:

evan

src/server/Logger.ts

@@ -7,22 +7,20 @@ import {
 import { OpenTelemetryTransportV3 } from "@opentelemetry/winston-transport";
 import * as dotenv from "dotenv";
 import winston from "winston";
-import { getServerConfigFromServer } from "../core/configuration/ConfigLoader";
 import { getOtelResource } from "./OtelResource";
+import { ServerEnv } from "./ServerEnv";
 dotenv.config();
 
-const config = getServerConfigFromServer();
-
 const resource = getOtelResource();
 
-if (config.otelEnabled()) {
+if (ServerEnv.otelEnabled()) {
   console.log("OTEL enabled");
   // Configure OpenTelemetry endpoint with basic auth (if provided)
   const headers: Record<string, string> = {};
-  headers["Authorization"] = "Basic " + config.otelAuthHeader();
+  headers["Authorization"] = "Basic " + ServerEnv.otelAuthHeader();
   // Add OTLP exporter for logs
   const logExporter = new OTLPLogExporter({
-    url: `${config.otelEndpoint()}/v1/logs`,
+    url: `${ServerEnv.otelEndpoint()}/v1/logs`,
     headers,
   });
 
@@ -58,7 +56,7 @@ const logger = winston.createLogger({
   ),
   defaultMeta: {
     service: "openfront",
-    environment: process.env.GAME_ENV ?? "prod",
+    environment: ServerEnv.gameEnvName(),
   },
   transports: [
     new winston.transports.Console(),