Refactor to manager-centric model, add team calendar for all users

Key changes:
- Removed office-centric model (deleted offices.py, office-rules)
- Renamed to team-rules, managers are part of their own team
- Team calendar visible to all (read-only for employees)
- Admins can have a manager assigned

README.md

@@ -18,7 +18,6 @@ A manager-centric parking spot management application with fair assignment algor
 │   ├── routes/          # API endpoints
 │   │   ├── auth.py      # Authentication + holidays
 │   │   ├── users.py     # User management
-│   │   ├── offices.py   # Office CRUD
 │   │   ├── managers.py  # Manager rules (closing days, guarantees)
 │   │   ├── presence.py  # Presence marking
 │   │   └── parking.py   # Parking assignments
@@ -116,8 +115,8 @@ Group mapping (follows lldap naming convention):
 
 | Role | Permissions |
 |------|-------------|
-| **admin** | Full access, manage users/offices |
-| **manager** | Manage assigned offices, set rules |
+| **admin** | Full access, manage users and managers |
+| **manager** | Manage their team, set parking rules |
 | **employee** | Mark own presence, view calendar |
 
 ## API Endpoints
@@ -137,12 +136,6 @@ Group mapping (follows lldap naming convention):
 - `GET /api/users/me/profile` - Own profile
 - `PUT /api/users/me/settings` - Own settings
 
-### Offices
-- `GET /api/offices` - List offices
-- `POST /api/offices` - Create office (admin)
-- `PUT /api/offices/{id}` - Update office (admin)
-- `DELETE /api/offices/{id}` - Delete office (admin)
-
 ### Managers
 - `GET /api/managers` - List managers
 - `GET /api/managers/{id}` - Manager details
@@ -169,7 +162,7 @@ Group mapping (follows lldap naming convention):
 Parking spots are assigned based on a fairness ratio:
 
 ```
-ratio = parking_days / office_days
+ratio = parking_days / presence_days
 ```
 
 Users with the lowest ratio get priority. Guaranteed users are always assigned first.