feat: add Fastify API server with health check and env config

apps/api/src/config.ts

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+import "dotenv/config";
+import { loadEnv } from "./lib/env.js";
+
+export const env = loadEnv();

apps/api/src/index.ts

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+import Fastify from "fastify";
+import cors from "@fastify/cors";
+import rateLimit from "@fastify/rate-limit";
+import { env } from "./config.js";
+import { APP_VERSION } from "@stirling-image/shared";
+
+const app = Fastify({
+  logger: true,
+  bodyLimit: env.MAX_UPLOAD_SIZE_MB * 1024 * 1024,
+});
+
+// Plugins
+await app.register(cors, { origin: true });
+await app.register(rateLimit, {
+  max: env.RATE_LIMIT_PER_MIN,
+  timeWindow: "1 minute",
+});
+
+// Health check
+app.get("/api/v1/health", async () => ({
+  status: "healthy",
+  version: APP_VERSION,
+  uptime: process.uptime().toFixed(0) + "s",
+  storage: { mode: env.STORAGE_MODE, available: "N/A" },
+  queue: { active: 0, pending: 0 },
+  ai: {},
+}));
+
+// Start
+try {
+  await app.listen({ port: env.PORT, host: "0.0.0.0" });
+  console.log(`Stirling Image API running on port ${env.PORT}`);
+} catch (err) {
+  app.log.error(err);
+  process.exit(1);
+}

apps/api/src/lib/env.ts

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+import { z } from "zod";
+
+const envSchema = z.object({
+  PORT: z.coerce.number().default(1349),
+  AUTH_ENABLED: z
+    .enum(["true", "false"])
+    .default("true")
+    .transform((v) => v === "true"),
+  DEFAULT_USERNAME: z.string().default("admin"),
+  DEFAULT_PASSWORD: z.string().default("admin"),
+  STORAGE_MODE: z.enum(["local", "s3"]).default("local"),
+  FILE_MAX_AGE_HOURS: z.coerce.number().default(24),
+  CLEANUP_INTERVAL_MINUTES: z.coerce.number().default(30),
+  MAX_UPLOAD_SIZE_MB: z.coerce.number().default(100),
+  MAX_BATCH_SIZE: z.coerce.number().default(200),
+  CONCURRENT_JOBS: z.coerce.number().default(3),
+  MAX_MEGAPIXELS: z.coerce.number().default(100),
+  RATE_LIMIT_PER_MIN: z.coerce.number().default(100),
+  DB_PATH: z.string().default("./data/stirling.db"),
+  WORKSPACE_PATH: z.string().default("./tmp/workspace"),
+  DEFAULT_THEME: z.enum(["light", "dark"]).default("light"),
+  DEFAULT_LOCALE: z.string().default("en"),
+  APP_NAME: z.string().default("Stirling Image"),
+});
+
+export type Env = z.infer<typeof envSchema>;
+
+export function loadEnv(): Env {
+  return envSchema.parse(process.env);
+}