Eddie/callsign upgrade (#642)

# Purpose
Closes #634 . Click to open!

# New Changes

- Replaced the old callsign csv with the one containing all data
- Extended AROUserCallsigns table to accommodate added fields
- Refactored callsigns.py to parse all values of csv
- Created migrate.py in backend directory to serve as the data migration
command handler with input validation
- Created alembic migration file for callsign table

Call ```python3 gs/backend/migrate.py``` to migrate all data.

Call ```python3 gs/backend/migrate.py callsigns``` or ```python3
gs/backend/migrate.py commands``` to migrate only callsigns or only main
commands respectively.

# Testing
Explain tests that you ran to verify code functionality.
- [x] I have unit-tested this PR. Otherwise, explain why it cannot be
unit-tested.

See screenshots below.

- [x] I have included screenshots of the tests performed below.

<img width="695" height="159" alt="Screenshot 2025-11-22 at 6 37 09 PM"
src="https://github.com/user-attachments/assets/b35dca92-86a4-46c7-b4f6-4a5bca9701be"
/>

<img width="1275" height="237" alt="Screenshot 2025-11-22 at 6 39 01 PM"
src="https://github.com/user-attachments/assets/95d1968b-1d58-42d5-a944-ceca379b770f"
/>

# Outstanding Changes
If there are non-critical changes (i.e. additional features) that can be
made to this feature in the future, indicate them here.

Someone please create a migration guide, took me a while to figure it
out.

Author: Syzygicality

gs/backend/api/lifespan.py

@@ -6,7 +6,6 @@
 from fastapi_cache.backends.inmemory import InMemoryBackend
 
 from gs.backend.data.database.engine import get_db_session, setup_database
-from gs.backend.data.resources.utils import add_callsigns, add_main_commands
 
 
 @asynccontextmanager
@@ -18,6 +17,4 @@ async def lifespan(_: FastAPI) -> AsyncGenerator[None, None]:
     # Must all the get_db_session each time when pass it into a separate function.
     # Otherwise, will get transaction is inactive error
     setup_database(get_db_session())
-    add_main_commands(get_db_session())
-    add_callsigns(get_db_session())
     yield