feat: implement multi-city support with city management features

- Added a new cities table to the database to manage multiple cities independently.
- Created a middleware to resolve city context based on X-City-Id header.
- Updated routes and services to handle city-specific data for routes, stops, and alerts.
- Implemented a CityContext in the frontend to manage active city state and provide city data across the application.
- Added a CitySelector component for users to switch between cities.
- Created a CitiesPage for admins to manage cities, including adding new cities with validation.
- Updated various components and pages to reflect the active city context, ensuring data is displayed correctly based on the selected city.
- Enhanced the schedule import functionality to restrict imports based on the active city.

backend/src/services/qualityReport.js

@@ -277,9 +277,23 @@ function buildQualityReport(rowsByCheck, checkedAt = new Date().toISOString()) {
   return { checked_at: checkedAt, summary, issues };
 }
 
-async function runQualityChecks(pool) {
-  const results = await Promise.all(qualityChecks.map(async ({ name, query }) => [name, (await pool.query(query)).rows]));
+function withCityScope(query, cityId) {
+  if (!cityId) return { query, params: [] };
+  return {
+    query: query
+      .replaceAll('r.is_active = true', 'r.is_active = true AND r.city_id = $1')
+      .replace('WHERE s.is_active = true', 'WHERE s.is_active = true AND s.city_id = $1')
+      .replace('WHERE a.is_active = true', 'WHERE a.is_active = true AND a.city_id = $1'),
+    params: [cityId]
+  };
+}
+
+async function runQualityChecks(pool, cityId = null) {
+  const results = await Promise.all(qualityChecks.map(async ({ name, query }) => {
+    const scoped = withCityScope(query, cityId);
+    return [name, (await pool.query(scoped.query, scoped.params)).rows];
+  }));
   return buildQualityReport(Object.fromEntries(results));
 }
 
-module.exports = { buildQualityReport, qualityChecks, runQualityChecks };
+module.exports = { buildQualityReport, qualityChecks, runQualityChecks, withCityScope };