pridanie rebricka (leaderboard)

Nova polozka menu Rebricek a stranka /leaderboard: top 10 podla najlepsej hry (hry len s ludmi / s aspon jednym botom) a podla hodin v hre (hry do 3 h). Backend api/leaderboard.py + socket udalost get_leaderboard, testy v tests/test_history.py.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YzEAACE9VgnLtXPuWGjwy

api/__init__.py

@@ -12,7 +12,7 @@ import socketio
 
 from bridzik import Bridzik, BridzikException, Card
 from db.db import init_db
-from api import auth as auth_module, history
+from api import auth as auth_module, history, leaderboard
 from api import bots as bots_module
 from api import stats as stats_module
 from api.auth import AuthError, RegistrationIncomplete
@@ -1016,3 +1016,14 @@ async def get_game_detail(sid, gid):
     if detail is None:
         return await send_error(sid, "Hra neexistuje.")
     await sio.emit("get_game_detail", detail, to=sid)
+
+
+# --- leaderboard (read-only) ----------------------------------------------
+
+@sio.on("get_leaderboard")
+async def get_leaderboard(sid, *args):
+    account = accounts.get(sid)
+    if account is None:
+        return await send_error(sid, "Musíte byť prihlásený.")
+    data = await leaderboard.get_leaderboard(account["player_id"])
+    await sio.emit("get_leaderboard", data, to=sid)