[Chore]: Add API smoke test script.

Pwease dont hurt mwee >.<

scripts/api-smoke-test.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+# 48hr.email API Smoke Test
+# Usage: bash api-smoke-test.sh
+#
+# This script tests the public API endpoints of https://48hr.email
+# It will register, login, check session, get account info, and list inboxes.
+#
+# NOTE: This will create a test user on the public service. Change the username each run if needed.
+
+BASE_URL="http://localhost:3000/api/v1"
+USERNAME="testuser$RANDOM"
+PASSWORD="TransientPass123!"
+COOKIE_JAR="cookies.txt"
+
+# Print section header with color
+function print_section() {
+  echo -e "\n==== $1 ===="
+}
+
+print_section "Register user ($USERNAME)"
+curl -s -X POST "$BASE_URL/auth/register" \
+  -H "Content-Type: application/json" \
+  -d "{\"username\":\"$USERNAME\",\"password\":\"$PASSWORD\"}" \
+  -c "$COOKIE_JAR"
+
+print_section "Login user"
+curl -s -X POST "$BASE_URL/auth/login" \
+  -H "Content-Type: application/json" \
+  -d "{\"username\":\"$USERNAME\",\"password\":\"$PASSWORD\"}" \
+  -c "$COOKIE_JAR"
+
+print_section "Get session info"
+curl -s -X GET "$BASE_URL/auth/session" \
+  -b "$COOKIE_JAR"
+
+print_section "Get account info"
+curl -s -X GET "$BASE_URL/account" \
+  -b "$COOKIE_JAR"
+
+print_section "List inbox (should be empty)"
+curl -s -X GET "$BASE_URL/inbox/$USERNAME@demo.local" \
+  -b "$COOKIE_JAR"
+
+print_section "Get mail summaries (public)"
+curl -s -X GET "$BASE_URL/inbox/$USERNAME@demo.local"
+
+print_section "Get locks (should be empty)"
+curl -s -X GET "$BASE_URL/locks" -b "$COOKIE_JAR"
+
+print_section "Get stats (public)"
+curl -s -X GET "$BASE_URL/stats"
+
+print_section "Get config (public)"
+curl -s -X GET "$BASE_URL/config/domains"
+
+rm -f "$COOKIE_JAR"