rename(phase 1): CapaKraken → Nexus across code, UI, docs, CI

- @capakraken/* → @nexus/* across 12 packages (root + 11 workspaces),
  1551 import lines migrated via codemod
- User-visible brand strings renamed (emails, page titles, PWA
  manifest, mobile header, MFA backup-codes header, tooltips, signin
  page, invite page, weekly digest, install prompt)
- TOTP issuer "CapaKraken" → "Nexus" (existing secrets still valid;
  re-enrollment relabels them in users' authenticator apps)
- Function rename: assertCapaKrakenDbTarget → assertNexusDbTarget
- LocalStorage migration shim in apps/web/src/app/layout.tsx copies
  capakraken_* → nexus_* on first load (guarded by nexus_migrated_v1
  sentinel; runs once per browser, then never again)
- Service-worker cache name capakraken-v2 → nexus-v2 with one-time
  caches.delete('capakraken-v2') from the same shim
- Email-domain fixtures @capakraken.{dev,app} → @nexus.{dev,app} in
  seed data, e2e specs, SMTP default fallback
- Dockerfile.dev / Dockerfile.prod / all .github/workflows/*.yml
  pnpm --filter @capakraken/* → @nexus/*
- README, CLAUDE.md, LEARNINGS.md, all docs/*.md, .env.example,
  tooling/deploy/.env.production.example brand sweep

Phase 1 deliberately leaves untouched (handled in Phase 3 cutover):
- PostgreSQL DB name "capakraken" and POSTGRES_USER "capakraken"
- Volume names capakraken_pgdata etc.
- Compose project name "capakraken" / "capakraken-prod"
- db-target-guard default expectedDatabase
- env-var CAPAKRAKEN_EXPECTED_DB_NAME
- Container DNS names in docker-compose.ci.yml

Quality gates green: pnpm typecheck (7/7), pnpm test:unit (7/7),
pnpm lint (0 errors), check:exports/imports/architecture all pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "capakraken",
+  "name": "nexus",
   "version": "0.1.0",
   "private": true,
   "scripts": {
@@ -11,7 +11,7 @@
     "test": "node ./scripts/run-from-workspace-root.mjs turbo run test:unit --concurrency=2",
     "test:unit": "node ./scripts/run-from-workspace-root.mjs turbo test:unit --concurrency=2",
     "test:e2e": "node ./scripts/run-from-workspace-root.mjs turbo test:e2e",
-    "test:e2e:email": "pnpm --filter @capakraken/web test:e2e:email",
+    "test:e2e:email": "pnpm --filter @nexus/web test:e2e:email",
     "test:scripts": "node --test scripts/*.test.mjs",
     "audit": "pnpm audit --audit-level=high",
     "check:unused": "knip",
@@ -26,20 +26,20 @@
     "db:migrate": "node ./scripts/prisma-with-env.mjs migrate dev",
     "db:generate": "node ./scripts/prisma-with-env.mjs generate",
     "db:validate": "node ./scripts/prisma-with-env.mjs validate",
-    "db:seed": "node ./scripts/with-env.mjs pnpm --filter @capakraken/db db:seed",
+    "db:seed": "node ./scripts/with-env.mjs pnpm --filter @nexus/db db:seed",
     "db:seed:export": "node ./scripts/export-dev-seed.mjs",
     "db:seed:import": "node ./scripts/import-dev-seed.mjs",
-    "db:studio": "node ./scripts/with-env.mjs pnpm --filter @capakraken/db db:studio",
-    "db:reset:dispo": "pnpm --filter @capakraken/db db:reset:dispo",
-    "db:import:dispo": "pnpm --filter @capakraken/db db:import:dispo",
-    "db:readiness:demand-assignment": "pnpm --filter @capakraken/db db:readiness:demand-assignment",
+    "db:studio": "node ./scripts/with-env.mjs pnpm --filter @nexus/db db:studio",
+    "db:reset:dispo": "pnpm --filter @nexus/db db:reset:dispo",
+    "db:import:dispo": "pnpm --filter @nexus/db db:import:dispo",
+    "db:readiness:demand-assignment": "pnpm --filter @nexus/db db:readiness:demand-assignment",
     "format": "prettier --write \"**/*.{ts,tsx,md,json}\"",
     "typecheck": "node ./scripts/run-from-workspace-root.mjs turbo typecheck",
     "prepare": "husky"
   },
   "devDependencies": {
-    "@capakraken/eslint-config": "workspace:*",
-    "@capakraken/tsconfig": "workspace:*",
+    "@nexus/eslint-config": "workspace:*",
+    "@nexus/tsconfig": "workspace:*",
     "husky": "^9.1.7",
     "knip": "^6.3.1",
     "lint-staged": "^16.4.0",