🔥 JSON-хранилище: данные в data/*.json вместо in-memory

- Переписан memory.py: теперь загружает/сохраняет users.json и bookings.json в data/
- booking_service.py: импорты через функции, а не переменные
- start.py, profile.py: используют get_user/set_user вместо прямого импорта users
- Добавлена папка data/ с .gitkeep

app/db/memory.py

@@ -1,2 +1,113 @@
-users = {}
-bookings = []
+import json
+import os
+from pathlib import Path
+
+DB_DIR = Path(__file__).resolve().parent.parent.parent / data
+DB_DIR.mkdir(exist_ok=True)
+
+USERS_FILE = DB_DIR / users.json
+BOOKINGS_FILE = DB_DIR / bookings.json
+
+
+def _load_json(path, default):
+    if path.exists():
+        try:
+            with open(path, r, encoding=utf-8) as f:
+                return json.load(f)
+        except (json.JSONDecodeError, OSError):
+            return default
+    return default
+
+
+def _save_json(path, data):
+    with open(path, w, encoding=utf-8) as f:
+        json.dump(data, f, ensure_ascii=False, indent=2)
+
+
+# ——— Users ———
+
+def load_users():
+    return _load_json(USERS_FILE, {})
+
+
+def save_users(users):
+    _save_json(USERS_FILE, users)
+
+
+def get_user(user_id):
+    users = load_users()
+    return users.get(str(user_id))
+
+
+def set_user(user_id, data):
+    users = load_users()
+    users[str(user_id)] = data
+    save_users(users)
+
+
+# ——— Bookings ———
+
+def load_bookings():
+    return _load_json(BOOKINGS_FILE, [])
+
+
+def save_bookings(bookings):
+    _save_json(BOOKINGS_FILE, bookings)
+
+
+def create_booking(user_id, service, master, date, time):
+    bookings = load_bookings()
+    booking = {
+        id: len(bookings) + 1,
+        user_id: user_id,
+        service: service,
+        master: master,
+        date: date,
+        time: time,
+        status: active,
+    }
+    bookings.append(booking)
+    save_bookings(bookings)
+    return booking
+
+
+def get_busy_times(master, date):
+    bookings = load_bookings()
+    return [
+        b[time] for b in bookings
+        if b[master] == master
+        and b[date] == date
+        and b[status] == active
+    ]
+
+
+def get_user_bookings(user_id):
+    bookings = load_bookings()
+    return [
+        b for b in bookings
+        if b[user_id] == user_id
+        and b[status] == active
+    ]
+
+
+def cancel_booking(booking_id):
+    bookings = load_bookings()
+    for b in bookings:
+        if b[id] == booking_id:
+            b[status] = cancelled
+            save_bookings(bookings)
+            return True
+    return False
+
+
+def update_booking(booking_id, service, master, date, time):
+    bookings = load_bookings()
+    for b in bookings:
+        if b[id] == booking_id:
+            b[service] = service
+            b[master] = master
+            b[date] = date
+            b[time] = time
+            save_bookings(bookings)
+            return b
+    return None