Flatbread Company is looking to build an addition to its pizza restaurant and bowling alley on Day Street in Davis Square, according to the city’s Planning Department. The proposal calls for the restaurant to expand into abutting 49 Day St. , a building most recently used as an auto garage. The annex would include more indoor seating, seven new bowling lanes, and an outdoor patio with seating for approximately 75 people. The city’s planning staff conditionally recommended approval of the proposal in July, according to a city memo. It is now under review by the Planning Board.