v1.1.0 Kalendarz i listy zakupów

Dodaje wspólny kalendarz wydarzeń grupy (zakres dat/godzin, cały dzień,
notatki, lokalizacja, uczestnicy z gospodarstwa + goście zewnętrzni)
oraz listy zakupów (wiele list, dodawanie/edycja/odznaczanie/usuwanie
produktów). Nowe tabele w schemacie SQLite są czysto addytywne
(CREATE TABLE IF NOT EXISTS), więc nie ruszają istniejących danych.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/src/db/schema.sql

@@ -78,6 +78,50 @@ CREATE TABLE IF NOT EXISTS settlements (
   settled_at TEXT NOT NULL DEFAULT (datetime('now'))
 );
 
+CREATE TABLE IF NOT EXISTS events (
+  id TEXT PRIMARY KEY,
+  household_id TEXT NOT NULL REFERENCES households(id) ON DELETE CASCADE,
+  created_by TEXT NOT NULL REFERENCES users(id),
+  title TEXT NOT NULL,
+  notes TEXT,
+  location TEXT,
+  all_day INTEGER NOT NULL DEFAULT 0,
+  start_at TEXT NOT NULL,
+  end_at TEXT NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS event_attendees (
+  id TEXT PRIMARY KEY,
+  event_id TEXT NOT NULL REFERENCES events(id) ON DELETE CASCADE,
+  user_id TEXT REFERENCES users(id) ON DELETE CASCADE,
+  guest_name TEXT
+);
+
+CREATE TABLE IF NOT EXISTS shopping_lists (
+  id TEXT PRIMARY KEY,
+  household_id TEXT NOT NULL REFERENCES households(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  created_by TEXT NOT NULL REFERENCES users(id),
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS shopping_list_items (
+  id TEXT PRIMARY KEY,
+  list_id TEXT NOT NULL REFERENCES shopping_lists(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  quantity TEXT,
+  checked INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
 CREATE INDEX IF NOT EXISTS idx_expenses_household ON expenses(household_id);
 CREATE INDEX IF NOT EXISTS idx_expense_shares_expense ON expense_shares(expense_id);
 CREATE INDEX IF NOT EXISTS idx_settlements_household ON settlements(household_id);
+CREATE INDEX IF NOT EXISTS idx_events_household ON events(household_id);
+CREATE INDEX IF NOT EXISTS idx_event_attendees_event ON event_attendees(event_id);
+CREATE INDEX IF NOT EXISTS idx_shopping_lists_household ON shopping_lists(household_id);
+CREATE INDEX IF NOT EXISTS idx_shopping_list_items_list ON shopping_list_items(list_id);