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- removed the commandboard-api credshare backend (superseded by the PWA) and its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

@@ -0,0 +1,33 @@
+// Apply SQL migrations in order. Idempotent — tracks applied files in _migrations.
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath, pathToFileURL } from "node:url";
+import { db, run, all } from "./db.mjs";
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+const DIR = path.join(HERE, "migrations");
+
+export async function migrate() {
+  // Bootstrap the tracking table (the first migration also declares it IF NOT EXISTS).
+  await run(`CREATE TABLE IF NOT EXISTS _migrations (name TEXT PRIMARY KEY, applied_at INTEGER NOT NULL)`);
+  const done = new Set((await all(`SELECT name FROM _migrations`)).map((r) => r.name));
+
+  const files = fs.readdirSync(DIR).filter((f) => f.endsWith(".sql")).sort();
+  for (const file of files) {
+    if (done.has(file)) { console.log(`· ${file} (already applied)`); continue; }
+    const sql = fs.readFileSync(path.join(DIR, file), "utf8");
+    // libSQL executes one statement per call — split on semicolons at line ends.
+    const statements = sql.split(/;\s*(?:\n|$)/).map((s) => s.trim()).filter(Boolean);
+    for (const stmt of statements) await run(stmt);
+    await run(`INSERT INTO _migrations (name, applied_at) VALUES (?, ?)`, [file, Date.now()]);
+    console.log(`✓ ${file}`);
+  }
+  console.log("migrations up to date");
+}
+
+// Run directly (npm run migrate) — not when imported by the server.
+if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
+  migrate()
+    .then(() => db.close?.())
+    .catch((e) => { console.error(e); process.exit(1); });
+}