Version updates & refactoring across the stack

Updates to `backend`:
- FastAPI 0.99 -> 0.109 (Inboard 0.51 -> 0.68)
- Pydantic 1.10 -> 2.7.1

Updates to `frontend`:
- NuxtJS 3.6.5 -> 3.11.2
- Nuxtjs i18n 8.0.0 RC -> 8.3.1

The Pydantic change is dramatic, so please revise their [migration guide](https://docs.pydantic.dev/2.7/migration/). Similarly, [nuxt/i18n](https://i18n.nuxtjs.org/docs/getting-started) has some major quality of life improvements.

This update necessitated refactoring across the stack.

Updated generated README

Bumped to version 0.8.1

Minor fixes for Docker build

Merge pull request #37 from whythawk/i18n-and-pwa

I18n and pwa

Merge pull request #35 from whythawk/upgrade-path-to-pydantic-2.0

Complete update of stack to latest long-term releases.

- `frontend`:
  - Node 16 -> 18
  - Nuxt 3.2 -> 3.6.5
   - Latest Pinia requires changes in stores, where imports are not required (cause actual errors), and parameter declaration must happen in functions.
- `backend` and `celeryworker`:
  - Python 3.9 -> 3.11
  - FastAPI 0.88 -> 0.99 (Inboard 0.37 -> 0.51)
  - Poetry -> Hatch
  - Postgres 14 -> 15

Update to 0.7.3 release

Merge pull request #20 from whythawk/add-contact-page

Added new contact page

Update to 0.7.1 release

Magic login and TOTP features

- New feature: magic (email-based) login, with password fallback
- New feature: Time-based One-Time Password (TOTP) authentication
- Security enhancements to improve consistency, safety and reliability of the authentication process (see full description in the frontend app)
- Refactoring of `login` APIs
- Requires one new `frontend` dependency: [QRcode.vue](https://github.com/scopewu/qrcode.vue)