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>

tooling/deploy/.env.production.example

@@ -1,7 +1,7 @@
 # Runtime settings consumed by the app and by docker-compose.prod.yml on the target host.
 
 POSTGRES_PASSWORD=replace-with-a-long-random-password
-NEXTAUTH_URL=https://capakraken.example.com
+NEXTAUTH_URL=https://nexus.example.com
 NEXTAUTH_SECRET=replace-with-a-long-random-secret
 RATE_LIMIT_BACKEND=redis
 
@@ -15,5 +15,5 @@ SMTP_HOST=
 SMTP_PORT=587
 SMTP_USER=
 SMTP_PASSWORD=
-SMTP_FROM=CapaKraken <notifications@example.com>
+SMTP_FROM=Nexus <notifications@example.com>
 ANONYMIZATION_SEED=

tooling/eslint/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@capakraken/eslint-config",
+  "name": "@nexus/eslint-config",
   "version": "0.1.0",
   "private": true,
   "type": "module",

tooling/prettier/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@capakraken/prettier-config",
+  "name": "@nexus/prettier-config",
   "version": "0.1.0",
   "private": true,
   "exports": {

tooling/typescript/package.json

@@ -1,7 +1,9 @@
 {
-  "name": "@capakraken/tsconfig",
+  "name": "@nexus/tsconfig",
   "version": "0.1.0",
   "private": true,
-  "files": ["*.json"],
+  "files": [
+    "*.json"
+  ],
   "license": "MIT"
 }