Project legacy simplification

[kentcdodds]

Simplify the project generator by removing all legacy code paths, squashing D1 migrations, and updating documentation.

As this is a project generator, backwards compatibility is not a concern. This PR removes all historical and legacy code, including older D1 migrations, password hash compatibility, and unused build configurations, to ensure the generated project starts from a clean, current baseline. Documentation and CI are updated to reflect only the current practices.

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Note

Medium Risk
Touches authentication verification code paths and database migration history; mistakes could break logins or fresh/remote migration application. Changes are otherwise straightforward deletions/simplification with limited runtime surface area.

Overview
Simplifies the generated project baseline by removing legacy/unused tooling and compatibility paths.

D1 migrations are squashed by folding password_resets and mock_resend_messages into migrations/0001-init.sql and deleting 0002/0003, and the production deploy workflow now applies migrations against the APP_DB binding.

Legacy password-hash support is removed: verifyPassword now returns a boolean only and login/OAuth handlers no longer attempt on-login hash upgrades. Client bundling support via Vite is dropped by deleting vite.config.ts, removing @cloudflare/vite-plugin/cross-env from deps, and updating TS/docs to stop referencing the Vite config.

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🔎 Preview deployed: https://epicflare-pr-35.kentcdodds.workers.dev

Worker: epicflare-pr-35
D1: epicflare-pr-35-db
KV: epicflare-pr-35-oauth-kv

Mocks:

• resend: https://epicflare-pr-35-mock-resend.kentcdodds.workers.dev/__mocks (epicflare-pr-35-mock-resend)