feat: initial release of Quick API

Express server that automatically generates REST endpoints from JSON files.

src/config/config.js

@@ -0,0 +1,47 @@
+/**
+ * @file config/config.js
+ * @description Centralized configuration for Quick API.
+ *              All configurable values live here.
+ *              Environment variables take priority over defaults.
+ *
+ * Supported environment variables:
+ *   PORT        - Listening port              (default: 3000)
+ *   DATA_DIR    - Path to the JSON files      (default: ./data)
+ *   BODY_LIMIT  - Maximum request body size   (default: 10mb)
+ *   LOG_ENABLED - Enable HTTP request logging (default: true)
+ */
+
+'use strict';
+
+const path = require('path');
+
+const config = {
+  /** Server listening port */
+  port: parseInt(process.env.PORT || '3000', 10),
+
+  /** Directory containing the JSON files to expose */
+  dataDir: process.env.DATA_DIR
+    ? path.resolve(process.env.DATA_DIR)
+    : path.resolve(__dirname, '../../data'),
+
+  /** Maximum request body size for POST requests */
+  bodyLimit: process.env.BODY_LIMIT || '10mb',
+
+  /** Enable HTTP request logging */
+  logEnabled: process.env.LOG_ENABLED !== 'false',
+
+  /** CORS configuration */
+  cors: {
+    origin: '*',
+    exposedHeaders: ['X-Total-Count', 'X-Page', 'X-Limit'],
+  },
+
+  /** Default pagination values */
+  pagination: {
+    defaultPage:  1,
+    defaultLimit: 0,   // 0 = no limit (returns all records)
+    maxLimit:     500, // safety cap to avoid oversized responses
+  },
+};
+
+module.exports = config;