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- removed the commandboard-api credshare backend (superseded by the PWA) and its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/src/db.mjs

@@ -0,0 +1,29 @@
+// libSQL (SQLite / Turso) client + a tiny query helper.
+import { createClient } from "@libsql/client";
+import fs from "node:fs";
+import path from "node:path";
+import { config } from "./config.mjs";
+
+// For a local file: url, make sure the directory exists.
+if (config.db.url.startsWith("file:")) {
+  const p = config.db.url.slice("file:".length);
+  const dir = path.dirname(path.resolve(config.root, p));
+  fs.mkdirSync(dir, { recursive: true });
+}
+
+export const db = createClient({ url: config.db.url, authToken: config.db.authToken });
+
+/** Run a statement; returns the raw result. */
+export const run = (sql, args = []) => db.execute({ sql, args });
+
+/** First row (or null). */
+export async function get(sql, args = []) {
+  const r = await db.execute({ sql, args });
+  return r.rows[0] ?? null;
+}
+
+/** All rows. */
+export async function all(sql, args = []) {
+  const r = await db.execute({ sql, args });
+  return r.rows;
+}