Refactor main to use find_nearest instead of fetch_and_print_objects

[soniapi]

The user requested to remove fetch_and_print_objects() from main.rs and replace its usage with the find_nearest() function.

1. Removed fetch_and_print_objects() function definition entirely from src/bin/main.rs.
2. Replaced the two calls to fetch_and_print_objects inside main() with calls to find_nearest.
3. Verified the codebase still compiles and test suites pass.
4. Executed application against an empty PostgreSQL database to ensure logic functions identically.

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PR created automatically by Jules for task 12974208738714225049 started by @soniapi

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