Add badges, checkins, and transport endpoints

Introduce gamification and check-in support plus expanded transport/admin APIs. Added DDL for checkins, badges and user_badges. New repositories: badgeRepository, userBadgeRepository, checkinRepository. New routes: admin badge management, admin transport (lines/platforms/stations), public transport endpoints, user checkins and stations endpoints, and user badges on /me. Services updated: adminService (badge CRUD & user assignment), userService (checkins, badge queries), authService (hasAdminRights). Minor package.json name update. These changes implement database, repo, service and route wiring for badges, user_badins and checkin features and additional transport admin routes.

repositories/userBadgeRepository.js

@@ -0,0 +1,64 @@
+const { pool } = require("../modules/database")
+const { DefaultError } = require("../errors/errors")
+
+async function assignBadgeToUser(userId, badgeId) {
+    try {
+        const sql = "INSERT INTO `user_badges` (userId, badgeId) VALUES (?, ?)"
+        const rows = await pool.query(sql, [userId, badgeId])
+        return rows.insertId
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function findUserBadges(userId) {
+    try {
+        const sql = `SELECT ub.*, b.name, b.description, b.icon, b.condition 
+                     FROM \`user_badges\` ub
+                     JOIN \`badges\` b ON ub.badgeId = b.id
+                     WHERE ub.userId = ?
+                     ORDER BY ub.unlockedAt DESC`
+        const rows = await pool.query(sql, [userId])
+        return rows
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function hasBadge(userId, badgeId) {
+    try {
+        const sql = "SELECT COUNT(*) as count FROM `user_badges` WHERE userId = ? AND badgeId = ?"
+        const rows = await pool.query(sql, [userId, badgeId])
+        return rows[0].count > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function removeBadgeFromUser(userId, badgeId) {
+    try {
+        const sql = "DELETE FROM `user_badges` WHERE userId = ? AND badgeId = ?"
+        const rows = await pool.query(sql, [userId, badgeId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function countUserBadges(userId) {
+    try {
+        const sql = "SELECT COUNT(*) as count FROM `user_badges` WHERE userId = ?"
+        const rows = await pool.query(sql, [userId])
+        return rows[0].count
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+module.exports = {
+    assignBadgeToUser,
+    findUserBadges,
+    hasBadge,
+    removeBadgeFromUser,
+    countUserBadges
+}