Configuration loader and Bull queue initialization

src/config/index.js

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+const path = require("path");
+require("dotenv").config({ path: path.resolve(__dirname, "../../.env") });
+
+module.exports = {
+  port: parseInt(process.env.PORT || "5100"),
+  host: process.env.HOST || "0.0.0.0",
+
+  redis: {
+    host: process.env.REDIS_HOST || "127.0.0.1",
+    port: parseInt(process.env.REDIS_PORT || "6379"),
+    password: process.env.REDIS_PASSWORD || undefined,
+    db: parseInt(process.env.REDIS_DB || "2"),
+  },
+
+  storage: {
+    uploadDir: path.resolve(process.env.UPLOAD_DIR || "./uploads"),
+    outputDir: path.resolve(process.env.OUTPUT_DIR || "./processed"),
+    maxFileSize: parseInt(process.env.MAX_FILE_SIZE || "20971520"), // 20MB
+  },
+
+  worker: {
+    concurrency: parseInt(process.env.CONCURRENCY || "2"),
+  },
+
+  bullBoard: {
+    user: process.env.BULL_BOARD_USER || "admin",
+    pass: process.env.BULL_BOARD_PASS || "changeme",
+  },
+};

src/config/queue.js

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+const Bull = require("bull");
+const config = require("./index");
+
+/**
+ * One queue, multiple job types.
+ * Bull stores everything in Redis db 2 under the "imgforge:" prefix.
+ * Job types: resize, convert, compress, watermark, strip-meta, pipeline
+ */
+const imageQueue = new Bull("imgforge", {
+  redis: {
+    host: config.redis.host,
+    port: config.redis.port,
+    password: config.redis.password,
+    db: config.redis.db,
+  },
+  defaultJobOptions: {
+    attempts: 3,
+    backoff: { type: "exponential", delay: 2000 },
+    removeOnComplete: { age: 3600 * 24 }, // keep completed jobs 24h
+    removeOnFail: { age: 3600 * 72 },     // keep failed jobs 72h
+  },
+});
+
+imageQueue.on("error", (err) => {
+  console.error("[Queue] Redis connection error:", err.message);
+});
+
+module.exports = imageQueue;