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)

docs/DEVELOPMENT.md

@@ -35,7 +35,7 @@ src/
 
 - **Node.js 22 LTS** — the Dockerfile base is `node:22-alpine`; match this locally
 - **pnpm 11.5.1** — managed via corepack (`corepack enable pnpm`)
-- **Docker + Docker Compose** — for MariaDB and Redis in dev
+- **Docker + Docker Compose** — for MariaDB in dev
 - **TypeScript 5.x** — installed per-workspace as a dev dependency
 
 ## Local Setup
@@ -48,13 +48,13 @@ pnpm install
 
 This installs all workspace packages (`apps/api` and `apps/pwa`) in a single pass.
 
-### 2. Start the dev database and Redis
+### 2. Start the dev database
 
 ```bash
-docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb redis -d
+docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb -d
 ```
 
-The dev override (`docker-compose.dev.yml`) exposes MariaDB on `localhost:3306` and Redis on `localhost:6379`.
+The dev override (`docker-compose.dev.yml`) exposes MariaDB on `localhost:3306`.
 
 ### 3. Configure environment variables
 
@@ -238,17 +238,16 @@ Migration files live in `apps/api/src/db/migrations/` and are committed to versi
 ## Docker Compose Dev Stack
 
 ```bash
-# Bring up the full dev stack (API in Docker + MariaDB + Redis, with ports exposed)
+# Bring up the full dev stack (API in Docker + MariaDB, with ports exposed)
 docker compose -f docker-compose.yml -f docker-compose.dev.yml up
 
 # Bring up only backing services (run API on host for faster iteration)
-docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb redis -d
+docker compose -f docker-compose.yml -f docker-compose.dev.yml up mariadb -d
 ```
 
 The dev override:
 
 - Exposes MariaDB on `localhost:3306`
-- Exposes Redis on `localhost:6379`
 - Mounts `apps/api/src` into the container for live source access
 - Sets `NODE_ENV=development`