Add M365 License Calculator feature

New top-nav section with a CSV-based license calculator. Upload an Azure AD
user export to see license counts (M365 Standard/Basic, Defender P1, PBI Pro,
PBI Premium) grouped by QWE Client. QWE Client and IsRestaurant are editable
per user, saved to SQLite, and restored on the next upload. Department-based
defaults pre-populate QWE Client (AT→QWE AT, SK→QWE SK) when no saved value
exists.

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

app/database.py

@@ -1,6 +1,6 @@
 import os
 import datetime
-from sqlalchemy import create_engine, Column, Integer, String, DateTime
+from sqlalchemy import create_engine, Column, Integer, String, DateTime, Boolean
 from sqlalchemy.orm import declarative_base, sessionmaker
 
 DATABASE_URL = f"sqlite:///{os.getenv('DB_PATH', '/data/audit.db')}"
@@ -10,6 +10,15 @@ SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 Base = declarative_base()
 
 
+class M365UserOverride(Base):
+    __tablename__ = "m365_user_overrides"
+
+    username = Column(String, primary_key=True)  # User principal name
+    qwe_client = Column(String, default="", nullable=False)
+    is_restaurant = Column(Boolean, default=False, nullable=False)
+    updated_at = Column(DateTime, default=datetime.datetime.utcnow)
+
+
 class RebootLog(Base):
     __tablename__ = "reboot_log"