Adding first working version

backend/scripts/load-env.mjs

@@ -0,0 +1,49 @@
+import { existsSync, readFileSync } from 'node:fs'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+function parseEnvLine(line) {
+  const trimmed = line.trim()
+  if (!trimmed || trimmed.startsWith('#')) return null
+
+  const equalsIndex = trimmed.indexOf('=')
+  if (equalsIndex === -1) return null
+
+  const key = trimmed.slice(0, equalsIndex).trim()
+  let value = trimmed.slice(equalsIndex + 1).trim()
+  if (!/^[A-Za-z_][A-Za-z0-9_]*$/.test(key)) return null
+
+  if (
+    (value.startsWith('"') && value.endsWith('"')) ||
+    (value.startsWith("'") && value.endsWith("'"))
+  ) {
+    value = value.slice(1, -1)
+  }
+
+  return { key, value }
+}
+
+function loadEnvFile(path) {
+  if (!existsSync(path)) return
+
+  const content = readFileSync(path, 'utf8')
+  for (const line of content.split(/\r?\n/)) {
+    const parsed = parseEnvLine(line)
+    if (!parsed || process.env[parsed.key] !== undefined) continue
+    process.env[parsed.key] = parsed.value
+  }
+}
+
+export function loadEnv() {
+  const moduleDir = dirname(fileURLToPath(import.meta.url))
+  const candidatePaths = [
+    resolve(process.cwd(), '.env'),
+    resolve(process.cwd(), '..', '.env'),
+    resolve(moduleDir, '..', '.env'),
+    resolve(moduleDir, '..', '..', '.env')
+  ]
+
+  for (const path of [...new Set(candidatePaths)]) {
+    loadEnvFile(path)
+  }
+}