feat: Space Booking System - MVP complet

Sistem web pentru rezervarea de birouri și săli de ședință
cu flux de aprobare administrativă.

Stack: FastAPI + Vue.js 3 + SQLite + TypeScript

Features implementate:
- Autentificare JWT + Self-registration cu email verification
- CRUD Spații, Utilizatori, Settings (Admin)
- Calendar interactiv (FullCalendar) cu drag-and-drop
- Creare rezervări cu validare (durată, program, overlap, max/zi)
- Rezervări recurente (săptămânal)
- Admin: aprobare/respingere/anulare cereri
- Admin: creare directă rezervări (bypass approval)
- Admin: editare orice rezervare
- User: editare/anulare rezervări proprii
- Notificări in-app (bell icon + dropdown)
- Notificări email (async SMTP cu BackgroundTasks)
- Jurnal acțiuni administrative (audit log)
- Rapoarte avansate (utilizare, top users, approval rate)
- Șabloane rezervări (booking templates)
- Atașamente fișiere (upload/download)
- Conflict warnings (verificare disponibilitate real-time)
- Integrare Google Calendar (OAuth2)
- Suport timezone (UTC storage + user preference)
- 225+ teste backend

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/schemas/reports.py

@@ -0,0 +1,64 @@
+"""Report schemas."""
+from datetime import date
+from typing import Any
+
+from pydantic import BaseModel
+
+
+class DateRangeFilter(BaseModel):
+    """Date range filter for reports."""
+
+    start_date: date | None = None
+    end_date: date | None = None
+
+
+class SpaceUsageItem(BaseModel):
+    """Space usage report item."""
+
+    space_id: int
+    space_name: str
+    total_bookings: int
+    approved_bookings: int
+    pending_bookings: int
+    rejected_bookings: int
+    canceled_bookings: int
+    total_hours: float
+
+
+class SpaceUsageReport(BaseModel):
+    """Space usage report."""
+
+    items: list[SpaceUsageItem]
+    total_bookings: int
+    date_range: dict[str, Any]
+
+
+class TopUserItem(BaseModel):
+    """Top user report item."""
+
+    user_id: int
+    user_name: str
+    user_email: str
+    total_bookings: int
+    approved_bookings: int
+    total_hours: float
+
+
+class TopUsersReport(BaseModel):
+    """Top users report."""
+
+    items: list[TopUserItem]
+    date_range: dict[str, Any]
+
+
+class ApprovalRateReport(BaseModel):
+    """Approval rate report."""
+
+    total_requests: int
+    approved: int
+    rejected: int
+    pending: int
+    canceled: int
+    approval_rate: float
+    rejection_rate: float
+    date_range: dict[str, Any]