Implemented Alumni DB admin dashboard

[mshi-27]

Summary

This pull request implements a new feature in the admin dashboard, Edit Alumni. Provides a nice UI to add alumni to the Firestore database, supporting location (compatible with the alumni map), image upload, and more.

• New Edit Alumni page at /admin/alumni-admin-view, linked from the main admin dashboard
• Searchable table of alumni; Add Alumni; per-row Edit / Delete;
• Profile image upload to Storage path alumImages/{uuid} (Cornell NetID required before upload); resolves alumImages/… paths via ImagesAPI for preview.
• Searchable dropdown backed by existing city-coordinate records; “Add …” calls geocoding to create a CityCoordinates row when needed; on save, syncs the alumni id on city-coordinate documents (remove from old pins, add to new) so the alumni map stays consistent.
• Endpoint POST /city-coordinates/geocode supports adding new locations

https://www.figma.com/design/ApnK2bbEIQqpRAyBAv7LDR/IDOL-Ashley-Working-File?node-id=758-6310&p=f&t=nrH1eQ0BEnbw3dke-0

Test Plan

• List/Search: Confirm table loads; search matches name, email, company, location, job fields, grad year, DTI roles, subteams.
• Add: Create an alumni with NetID, required fields, optional image upload; save; row appears.
• Edit: Change fields including location; save; verify Firestore alumni doc and that map-related city-coordinate docs add/remove the alumni id when location changes
• New location: Use “Add …” in the location dropdown; confirm geocoding succeeds or shows “Location not found…” when Nominatim returns nothing.
• Delete: Confirm modal; delete; alumni removed

Notes

• not sure how to update openapi.yaml with /alumni and /city-coordinates

[dti-github-bot]

[diff-counting] Significant lines: 1486. This diff might be too big! Developer leads are invited to review the code.

[mshi-27]

I will fix the linter errors causing the checks to fail ASAP, been a little busy

[CLAassistant]

All committers have signed the CLA.