feat: reword phase to epic, update mkdocs

docs/content/stories/epic5/README.md

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+# Epic 5: Infrastructure Adapters
+
+## Overview
+Implement infrastructure adapters (cache, queue, blob storage, email), make adapters swappable via interfaces, add scheduler/background jobs system, and implement event bus (in-process and Kafka).
+
+## Stories
+
+### 5.1 Cache System (Redis)
+- [Story: 5.1 - Cache System](./5.1-cache-system.md)
+- **Goal:** Implement a complete Redis-based caching system with a clean interface.
+- **Deliverables:** Cache interface, Redis implementation, configuration, DI integration
+
+### 5.2 Event Bus System
+- [Story: 5.2 - Event Bus](./5.2-event-bus.md)
+- **Goal:** Implement a complete event bus system supporting both in-process and Kafka.
+- **Deliverables:** Event bus interface, in-process bus, Kafka bus, core events
+
+### 5.3 Blob Storage System
+- [Story: 5.3 - Blob Storage](./5.3-blob-storage.md)
+- **Goal:** Implement a complete blob storage system using S3.
+- **Deliverables:** Blob storage interface, S3 implementation, file upload API
+
+### 5.4 Email Notification System
+- [Story: 5.4 - Email Notification](./5.4-email-notification.md)
+- **Goal:** Implement a complete email notification system with SMTP support.
+- **Deliverables:** Notification interface, SMTP implementation, email templates, identity integration
+
+### 5.5 Scheduler and Background Jobs System
+- [Story: 5.5 - Scheduler & Jobs](./5.5-scheduler-jobs.md)
+- **Goal:** Implement a complete scheduler and background job system.
+- **Deliverables:** Scheduler interface, Asynq implementation, job registry, example jobs
+
+### 5.6 Secret Store Integration
+- [Story: 5.6 - Secret Store](./5.6-secret-store.md)
+- **Goal:** Implement secret store integration supporting Vault and AWS Secrets Manager.
+- **Deliverables:** Secret store interface, Vault implementation, AWS implementation, config integration
+
+### 5.7 gRPC Service Definitions and Clients
+- [Story: 5.7 - gRPC Services](./5.7-grpc-services.md)
+- **Goal:** Implement gRPC service definitions and clients to enable microservices communication.
+- **Deliverables:** gRPC service definitions, gRPC servers, gRPC clients, code generation
+
+## Deliverables Checklist
+- [ ] Cache adapter (Redis) working
+- [ ] Event bus (in-process and Kafka) functional
+- [ ] Blob storage (S3) adapter
+- [ ] Email notification system
+- [ ] Scheduler and background jobs
+- [ ] Secret store integration (optional)
+- [ ] gRPC service definitions and clients
+
+## Acceptance Criteria
+- Cache stores and retrieves data correctly
+- Events are published and consumed
+- Files can be uploaded and downloaded
+- Email notifications are sent
+- Background jobs run on schedule
+- Integration test: full infrastructure stack works