Remove book, visitor, and worker data files to clean up the project and eliminate unused resources.

src/data/books.txt

@@ -1,8 +0,0 @@
-id=ccb1b578-8343-45de-a465-007af8af7c28;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Borrowed
-id=9ac18f0d-8bf7-4dfd-aa20-cc9b1b66e610;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Borrowed
-id=84d1af3f-db4e-4331-b94d-e846b0adeb06;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available
-id=088e4a3d-cb61-4894-a9f0-b62ed9bd4cc1;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available
-id=aba6d1d3-2c1e-4b14-948d-a370f0699da7;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available
-id=583f1c35-2f17-4006-9919-ce292cf6803a;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available
-id=25d250e9-c6ad-44e0-894a-bb5507da6971;title=Pride and Prejudice;author=Jane Austen;pages=279;year=1813;genre=Romance;status=Available
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src/data/visitors.txt

@@ -1 +0,0 @@
-id=10441103-8fc4-4975-8b6b-c26f87dcbc7c;name=John;surname=Doe;registrationDate="2025-12-15T11:50:53.837Z";currentBooks=["books:ccb1b578-8343-45de-a465-007af8af7c28","books:9ac18f0d-8bf7-4dfd-aa20-cc9b1b66e610"];history=[]

src/data/workers.txt

@@ -1 +0,0 @@
-id=77c37ac4-101c-47a5-a064-b4927e21fc8c;name=John;surname=Doe;experience=5;workDays=["Monday","Wednesday","Friday"];issuedBooks=["books:ccb1b578-8343-45de-a465-007af8af7c28","books:9ac18f0d-8bf7-4dfd-aa20-cc9b1b66e610"]