feat(pwa): logicsrc credentials app — real auth + Turso, redesigned; retire commandboard-api credshare

Adds apps/pwa: an Express + libSQL/Turso app that is now the home of team
credential sharing, with the moshcode-style auth stack ported and reskinned to
match logicsrc.com (light theme, Inter, green accent).

apps/pwa
- auth: email/password (scrypt), passkeys (WebAuthn), CoinPay OAuth, cookie
  sessions, and lsk_ API keys for the CLI via a loopback OAuth-PKCE flow
  (/cli/authorize + /cli/token). Ported from the moshcode PWA.
- credshare API (/api/credshare/*): teams, members, invites, vaults, sealed
  grants, ciphertext secrets, audit — authed by session OR Bearer lsk_ key.
  Zero-knowledge: only ciphertext + sealed vault keys + public keys stored.
- teams dashboard, accept-invite, and settings (API keys) pages, server-rendered
  in the LogicSRC brand (lib/html.mjs).
- migrations (libSQL) 001_auth + 002_credshare, migrate-on-boot; Turso via
  TURSO_DATABASE_URL / TURSO_AUTH_TOKEN, or a local file db for dev.
- trimmed moshcode-specific approvals/credits/push/deliver.

CLI
- `logicsrc login` now does browser loopback OAuth-PKCE against the app and
  stores an lsk_ token (email-OTP removed); --token for CI. Client repointed.

Distribution
- install.sh (served at logicsrc.com/install.sh) installs the CLI from the
  GitHub repo: tarball -> npm install -> `npm run build:cli` -> logicsrc wrapper.
- root build:cli builds only the CLI's workspace chain (skips web/api/next).

Cleanup
- removed the commandboard-api credshare backend (superseded by the PWA) and its
  Supabase/Turso stores + libsql dep; commandboard-api tests green (40).
- removed the Next.js /teams page (the PWA is the web UI now).

Verified end-to-end: two accounts register on the PWA, mint lsk_ keys, CLI login
uploads identity keys, owner pushes an encrypted .env, teammate invited ->
accepted -> granted -> pulls the exact file. Server stores ciphertext only.
Full workspace build + tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/pwa/.env.example

@@ -0,0 +1,22 @@
+# LogicSRC credentials app — copy to .env and fill in.
+NODE_ENV=development
+PORT=8080
+PUBLIC_ORIGIN=http://localhost:8080
+
+# datastore: Turso (libSQL) in prod, or file:./data/local.db for local dev
+TURSO_DATABASE_URL=file:./data/local.db
+TURSO_AUTH_TOKEN=
+
+# auth — generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+SESSION_SECRET=change-me-32-bytes-hex
+
+# email invites via Resend (optional — without it, invite tokens are returned in the API response)
+RESEND_API_KEY=
+CREDSHARE_EMAIL_FROM=LogicSRC <noreply@logicsrc.com>
+
+# "Sign in with CoinPay" (optional)
+COINPAY_API_BASE=https://coinpayportal.com
+COINPAY_OAUTH_AUTHORIZE_URL=https://coinpayportal.com/oauth/authorize
+COINPAY_OAUTH_TOKEN_URL=https://coinpayportal.com/api/oauth/token
+COINPAY_OAUTH_USERINFO_URL=https://coinpayportal.com/api/oauth/userinfo
+COINPAY_OAUTH_CLIENT_ID=