[09.11]_Frontend Design, Dropdown input implemented

[yoo-ran]

09.11

Front End:

• Create a root template for color and font size.
• Update the design.

Data Change:

• Convert dropdown data to ENUM in the database.
• Create a constant.js file to handle ENUM constant data.
• Update the server API to use the new ENUM values.
• Change input fields to select inputs on the client side.

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[haejoonchoi]

LGTM