Refactor Lost and Found Queries

[DikshantK2004]

The current implementation of queries related to lost and found items is split into two separate files: lost.py and found.py. Both files contain similar queries but operate on different tables. To streamline the code and reduce redundancy, we need to merge these files into a single file, lost_found.py. Additionally, we will introduce a new parameter type to distinguish between lost and found queries.

Tasks

1. Create a new file: /backend/backend/queries/lost_found.py.
2. Merge all functions from lost.py and found.py into lost_found.py.
3. Add a new parameter type to each function. The type parameter should be:
   • 0 for queries on the lost table.
   • 1 for queries on the found table.
4. Refactor the logic within each function to use the type parameter to determine which table to query.

Note: Pull requests (PRs) on branches other than backend will be closed.