feat: migrate SQLAlchemy from 1.4 to 2.0 with ORM style

- Remove encode/databases dependency, use native SQLAlchemy 2.0 async
- Convert all table definitions to Declarative Mapping pattern
- Update all controllers to accept session parameter (dependency injection)
- Convert all queries from Core style to ORM style
- Remove PostgreSQL compatibility checks (PostgreSQL only now)
- Add proper typing for engine and session factories

server/tests/conftest.py

@@ -69,17 +69,19 @@ def postgres_service(docker_ip, docker_services):
 @pytest.fixture(scope="function", autouse=True)
 @pytest.mark.asyncio
 async def setup_database(postgres_service):
-    from reflector.db import engine, metadata, get_database  # noqa
+    from reflector.db import get_engine
+    from reflector.db.base import metadata
 
-    metadata.drop_all(bind=engine)
-    metadata.create_all(bind=engine)
-    database = get_database()
+    async_engine = get_engine()
+
+    async with async_engine.begin() as conn:
+        await conn.run_sync(metadata.drop_all)
+        await conn.run_sync(metadata.create_all)
 
     try:
-        await database.connect()
         yield
     finally:
-        await database.disconnect()
+        await async_engine.dispose()
 
 
 @pytest.fixture

server/tests/test_room_ics.py

@@ -196,9 +196,9 @@ async def test_room_list_with_ics_enabled_filter():
     assert len(all_rooms) == 3
 
     # Filter for ICS-enabled rooms (would need to implement this in controller)
-    ics_rooms = [r for r in all_rooms if r["ics_enabled"]]
+    ics_rooms = [r for r in all_rooms if r.ics_enabled]
     assert len(ics_rooms) == 2
-    assert all(r["ics_enabled"] for r in ics_rooms)
+    assert all(r.ics_enabled for r in ics_rooms)
 
 
 @pytest.mark.asyncio