fix(start): lazy-init languages on /start to unblock cold-start orphans (#222)

Sega (#370728472) hit /start, immediately got "memes ended". Root cause:
no rows in user_language for him → recommendations query filters every
candidate out → cold start surfaces the empty-feed message.

How he ended up there: he registered on 2026-04-01 with deep_link
'kitchen'. The kitchen branch in handle_start returns BEFORE any
init_user_languages_from_tg_user call:

  if deep_link == "kitchen":
      return await handle_show_kitchen(update, context)

The wrapped + main "if created" branches both call init; kitchen
silently skipped it. Six new users in the last 30 days (4 via 'kitchen',
2 via deep_link=None) ended up the same way — all backfilled by hand
just now.

Fix: hoist a single idempotent check above the deep_link branching:

    if not await get_user_languages(user_id):
        await init_user_languages_from_tg_user(update.effective_user)

This covers every branch (current + future deep_links) and self-heals
any historical orphan the next time they /start. Removed the per-branch
init calls in wrapped + new-user paths since the new check supersedes
them. Idempotent guarantee: add_user_languages uses ON CONFLICT DO NOTHING.

Note on extent: 893 historical orphans exist (mostly pre-init code),
but only 6 were active in the last 30d / 3 in the last 7d — the bug
was not blocking the main onboarding funnel (38/38 new users in last
7d had languages). It was a long-tail correctness issue that bit any
share-link / deep-link path that returned early.

Author: ohld

src/tgbot/handlers/start.py

@@ -21,6 +21,7 @@
 from src.tgbot.service import (
     create_or_update_user,
     get_tg_user_by_id,
+    get_user_languages,
     log_user_deep_link,
     save_tg_user,
 )
@@ -102,18 +103,23 @@ async def handle_start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> No
         created,
     )
 
+    # Ensure language rows exist before any branch that may serve memes.
+    # Covers: new users on every deep_link path (kitchen used to skip init),
+    # and historical orphans whose init was never run — they were stuck on
+    # "memes ended" because recommendations filter by user_language.
+    # Idempotent: add_user_languages uses ON CONFLICT DO NOTHING.
+    if not await get_user_languages(user_id):
+        await init_user_languages_from_tg_user(update.effective_user)
+
     if deep_link == "kitchen":
         return await handle_show_kitchen(update, context)
 
     if deep_link == "wrapped":
         from src.tgbot.handlers.stats.wrapped import handle_wrapped
 
-        if created:
-            await init_user_languages_from_tg_user(update.effective_user)
         return await handle_wrapped(update, context)
 
     if created:  # new user:
-        await init_user_languages_from_tg_user(update.effective_user)
         await handle_language_settings(update, context)
 
         await handle_invited_user(