feat: Profil-Kategorien + Begrüßung in Zielsprache

languages.greeting (de/en/sv geseedet), neue pair_categories-Tabelle
(abgeleitet aus statement- und objektverknüpften Wörtern via
word_categories) inkl. Backfill für bereits veröffentlichte Pairs.
derivePairCategories() wird beim Publish (pairs + pipeline) aufgerufen.
/auth/me liefert language_target_greeting, /auth/stats liefert
categories[] mit Punkten je Kategorie fürs Profil.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/routes/auth.js

@@ -141,7 +141,8 @@ router.get('/me', requireJwt, async (req, res, next) => {
               COALESCE(up.daily_goal_ep, 30) AS daily_goal_ep,
               up.last_practice_at,
               ln.id AS language_native_id, ln.short_en AS language_native_short, ln.titel_de AS language_native_titel,
-              lt.id AS language_target_id, lt.short_en AS language_target_short, lt.titel_de AS language_target_titel
+              lt.id AS language_target_id, lt.short_en AS language_target_short, lt.titel_de AS language_target_titel,
+              lt.greeting AS language_target_greeting
          FROM users u
          LEFT JOIN users_public up ON up.user_id = u.id
          LEFT JOIN user_names  un  ON un.id = up.username_id
@@ -275,6 +276,22 @@ router.get('/stats', requireJwt, async (req, res, next) => {
       return { label, value: acc && acc.seen > 0 ? acc.correct / acc.seen : 0, seen: acc?.seen || 0 };
     });
 
+    // Punkte je Kategorie (Lebensmittel/Tiere/Beruf …) — abgeleitet über pair_categories.
+    // Mehrfach-Kategorien eines Pairs zählen bewusst zu jeder Kategorie.
+    const categoryRows = await query(
+      `SELECT c.id, c.titel_de AS label,
+              COALESCE(SUM(upp.earned_points), 0)::int AS points,
+              COALESCE(SUM(upp.seen_count), 0)::int    AS seen
+         FROM user_pair_progress upp
+         JOIN pair_categories pc ON pc.pair_id = upp.pair_id
+         JOIN categories c       ON c.id = pc.category_id
+        WHERE upp.user_id = $1
+        GROUP BY c.id, c.titel_de
+       HAVING SUM(upp.earned_points) > 0
+        ORDER BY points DESC`,
+      [userId]
+    );
+
     const t = totals.rows[0] || { pairs_practiced: 0, total_seen: 0, total_correct: 0 };
     const td = today.rows[0] || { ep: 0, cards: 0, daily_goal_ep: 30 };
 
@@ -288,6 +305,7 @@ router.get('/stats', requireJwt, async (req, res, next) => {
         accuracy: t.total_seen > 0 ? t.total_correct / t.total_seen : 0,
       },
       skills,
+      categories: categoryRows.rows,
     });
   } catch (err) { next(err); }
 });

src/routes/pairs.js

@@ -3,6 +3,7 @@ const { query } = require('../db');
 const { fillMissingRow } = require('../lib/translate');
 const { loadPairContext, computeReadiness, loadPairContent, translateWordGroup } = require('../lib/pairContent');
 const { deletePairDeep } = require('../lib/deleteCascade');
+const { derivePairCategories } = require('../lib/pairCategories');
 
 const STATUSES = ['draft', 'reviewed', 'blocked', 'published'];
 const ANSWER_TYPES = new Set(['yes_no', 'text', 'question', 'word']);
@@ -131,6 +132,11 @@ router.patch('/:id', async (req, res, next) => {
       values
     );
     if (!result.rows.length) return res.status(404).json({ error: 'Not found' });
+
+    // Beim Veröffentlichen Kategorien aus den verknüpften Wörtern ableiten (best effort).
+    if (req.body.status === 'published')
+      await derivePairCategories(result.rows[0].id).catch(() => {});
+
     res.json(result.rows[0]);
   } catch (err) { next(err); }
 });
@@ -295,6 +301,8 @@ router.post('/:id/publish', async (req, res, next) => {
       `UPDATE pairs SET status='published', published_at=COALESCE(published_at,$2) WHERE id=$1 RETURNING *`,
       [p.id, now]);
 
+    await derivePairCategories(p.id).catch(() => {});
+
     res.json({ ...upd.rows[0], published_languages: [lang] });
   } catch (err) { next(err); }
 });

src/routes/pipeline.js

@@ -7,6 +7,7 @@ const { enqueue, loadPairs, collectAudioUnits, generateWithBackoff, translatePai
 const { describeError } = require('./audios');
 const { PLACEHOLDER_RE, TOKEN_RE, stripLeakedTokens } = require('../lib/placeholders');
 const { invalidateAudio } = require('../lib/reviewPairs');
+const { derivePairCategories } = require('../lib/pairCategories');
 
 // ── Objekt-Wort-Erkennung in Sätzen (für die manuelle Zuweisung beim Review) ──
 
@@ -406,6 +407,9 @@ router.post('/picture/:id/publish', async (req, res, next) => {
     await query(`UPDATE pairs SET status='published', published_at=COALESCE(published_at,$2)
                   WHERE id = ANY($1)`, [pairIds, now]);
 
+    // Kategorien der veröffentlichten Pairs aus ihren Wörtern ableiten (best effort).
+    await derivePairCategories(pairIds).catch(() => {});
+
     // Verlinkte Wörter: nur 'generated' → 'published' (translated bleibt für die Bild-Generierung
     // im ServerMonitor-Flow; published würde diesen Schritt überspringen)
     let publishedWords = 0;