Google and Apple auth

[Ceesaxp]

Add ability to sign-up and sign-in using Google and Apple OAuth.

• Google
• Apple

[Ceesaxp]

Google added

[Ceesaxp]

Added the Apple auth implementation spec to \ in commit 14aa466.\n\nSpec: https://github.com/Ceesaxp/meet-when/blob/main/docs/02.%20APPLE-AUTH-SPEC.md\nCommit: 14aa466\n\nIt covers:\n- recommended rollout split between web parity and native menu bar parity\n- required code changes across config, DB, routes, handlers, services, templates, and the macOS app\n- Apple Developer setup and private email relay requirements\n- testing plan, edge cases, and implementation order

[Ceesaxp]

Added the Apple auth implementation spec to main in commit 14aa466.

Spec: https://github.com/Ceesaxp/meet-when/blob/main/docs/02.%20APPLE-AUTH-SPEC.md
Commit: 14aa466

It covers:

• recommended rollout split between web parity and native menu bar parity
• required code changes across config, DB, routes, handlers, services, templates, and the macOS app
• Apple Developer setup and private email relay requirements
• testing plan, edge cases, and implementation order