fix: get_categories always includes custom categories (v0.4.12)

Custom categories (rights.canDelete=true) have no locale field set by
the API and were silently excluded by the locale filter. They now bypass
both the locale and taskListType filters so they always appear in
get_categories output regardless of the locale parameter.

Also: deleted 7 test categories (TEmojiApple, Obst & Gemüse (old),
TestKategorie, ProbeKat2, [TEST]emoji=apple, ProbeKat1, TDelMeta)
and restored 'Obst & Gemüse' (emoji 🍎) as a clean custom category.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SPEC.md

@@ -150,6 +150,9 @@ a01.r.r.updatedCreated[]              → taskcategorysync (Kategorien/Abteilung
   .locale                             → Sprache des Namens (z.B. "de", "en", "ru", "fr", "es",
                                         "it", "nl", "pt", "sv", "ko", "ja")
                                         Jede Sprache = eigener Eintrag mit eigenem metaId/systemCategoryId
+                                        **Wichtig:** Custom-Kategorien (rights.canDelete='true') haben
+                                        kein locale-Feld gesetzt — sie werden sprachunabhängig
+                                        zurückgegeben und dürfen nie über locale gefiltert werden.
   .hiddenByTaskList                   → Liste von Listen-IDs, in denen die Kat. versteckt ist
 a02.r.r.updatedCreated[]              → tasksync (Tasks)
   .metaId                             → eindeutige Task-ID