docs(260618-smr): remove Redis references from documentation and e2e config

- CLAUDE.md: remove Redis constraint, ioredis library row, Redis architecture sentence, update compose comment
- README.md: remove Redis from prereqs, quick-start command, compose description, tech-stack live-sync row
- docs/ARCHITECTURE.md: delete Redis infrastructure table row
- docs/CONFIGURATION.md: remove Redis localhost:6379 mention from dev section
- docs/deployment.md: delete redis services table row
- docs/DEVELOPMENT.md: remove prereq mention, heading, two up commands, expose bullet, stack comment
- docs/GETTING-STARTED.md: prereq row, up command, prose mention
- docs/TESTING.md: 'API and MariaDB' (was API, MariaDB, and Redis)
- apps/pwa/e2e/README.md: delete Redis on :6379 bullet
- apps/pwa/playwright.config.ts: two comments updated (API+MariaDB, not API+MariaDB+Redis)

apps/pwa/e2e/README.md

@@ -15,7 +15,6 @@ The stack must include:
 - API on `:3000` started with `DEV_AUTH_BYPASS=true` (see Security Guardrail below)
 - PWA dev server on `:5173` (`pnpm --filter @familysync/pwa dev`)
 - Dev MariaDB on `:3306` (exposed via `docker-compose.dev.yml`)
-- Redis on `:6379`
 
 **`DEV_AUTH_BYPASS=true` MUST be set in the API's environment BEFORE the API process starts.** The harness cannot inject it at runtime — the API reads the env var once at startup. If the API is running without it, all `/api/*` requests return an auth redirect and every spec fails.