Hebrew group names + multilingual API + cleanup mock data

- task_groups.names JSONB with cs/he/ru/ua translations
- GET /groups?lang=he returns Hebrew names
- Removed 14 test users, cleaned orphan data
- 6 real users, 2 real tasks remain

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/groups.js

@@ -1,16 +1,28 @@
 // Task Team — Groups CRUD — 2026-03-29
 async function groupRoutes(app) {
     app.get('/groups', async (req) => {
+        const lang = req.query.lang;
         const { rows } = await app.db.query(
             'SELECT * FROM task_groups ORDER BY order_index ASC'
         );
-        return { data: rows };
+        const data = rows.map(row => {
+            if (lang && row.names && row.names[lang]) {
+                return { ...row, name: row.names[lang] };
+            }
+            return row;
+        });
+        return { data };
     });
 
     app.get('/groups/:id', async (req) => {
+        const lang = req.query.lang;
         const { rows } = await app.db.query('SELECT * FROM task_groups WHERE id = $1', [req.params.id]);
         if (!rows.length) throw { statusCode: 404, message: 'Group not found' };
-        return { data: rows[0] };
+        const row = rows[0];
+        if (lang && row.names && row.names[lang]) {
+            row.name = row.names[lang];
+        }
+        return { data: row };
     });
 
     app.post('/groups', async (req) => {
@@ -64,7 +76,6 @@ async function groupRoutes(app) {
         if (!Array.isArray(time_zones)) {
             throw { statusCode: 400, message: 'time_zones must be an array of [{days, from, to}]' };
         }
-        // Validate each timezone entry
         for (const tz of time_zones) {
             if (!Array.isArray(tz.days) || !tz.from || !tz.to) {
                 throw { statusCode: 400, message: 'Each timezone must have days (array), from (HH:MM), to (HH:MM)' };
@@ -84,7 +95,6 @@ async function groupRoutes(app) {
         if (!Array.isArray(locations)) {
             throw { statusCode: 400, message: 'locations must be an array of [{name, lat, lng, radius_m}]' };
         }
-        // Validate each location entry
         for (const loc of locations) {
             if (!loc.name || loc.lat === undefined || loc.lng === undefined) {
                 throw { statusCode: 400, message: 'Each location must have name, lat, lng' };