Build MVP with Pi installer and atomic updates

server/src/config.ts

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+import { resolve } from "node:path";
+import { z } from "zod";
+
+const booleanFromString = z
+  .enum(["true", "false"])
+  .default("false")
+  .transform((value) => value === "true");
+
+const schema = z.object({
+  NODE_ENV: z.enum(["development", "test", "production"]).default("development"),
+  HOST: z.string().default("127.0.0.1"),
+  PORT: z.coerce.number().int().min(1).max(65_535).default(8787),
+  DATABASE_PATH: z.string().default(resolve("data/companion.db")),
+  SESSION_TTL_HOURS: z.coerce.number().positive().max(24 * 30).default(24),
+  COOKIE_SECURE: booleanFromString,
+  ALLOWED_ORIGINS: z.string().default("http://mg4pi.local:8787"),
+  UPDATE_STATUS_PATH: z.string().default("/var/lib/pi-car-companion/update-status.json"),
+  VERSION_FILE: z.string().default(resolve("REVISION"))
+});
+
+export type AppConfig = {
+  nodeEnv: "development" | "test" | "production";
+  host: string;
+  port: number;
+  databasePath: string;
+  sessionTtlMs: number;
+  cookieSecure: boolean;
+  allowedOrigins: ReadonlySet<string>;
+  updateStatusPath: string;
+  versionFile: string;
+};
+
+export function loadConfig(environment: NodeJS.ProcessEnv = process.env): AppConfig {
+  const parsed = schema.parse(environment);
+  const allowedOrigins = new Set(
+    parsed.ALLOWED_ORIGINS.split(",")
+      .map((origin) => origin.trim())
+      .filter(Boolean)
+  );
+
+  if (parsed.NODE_ENV === "development") {
+    allowedOrigins.add("http://localhost:5173");
+    allowedOrigins.add("http://127.0.0.1:5173");
+  }
+
+  return {
+    nodeEnv: parsed.NODE_ENV,
+    host: parsed.HOST,
+    port: parsed.PORT,
+    databasePath: parsed.DATABASE_PATH,
+    sessionTtlMs: parsed.SESSION_TTL_HOURS * 60 * 60 * 1000,
+    cookieSecure: parsed.COOKIE_SECURE,
+    allowedOrigins,
+    updateStatusPath: parsed.UPDATE_STATUS_PATH,
+    versionFile: parsed.VERSION_FILE
+  };
+}