feat: reword phase to epic, update mkdocs

docs/content/stories/epic4/README.md

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+# Epic 4: Sample Feature Module (Blog)
+
+## Overview
+Create a complete sample module (Blog) to demonstrate the framework, showing how to add routes, permissions, database entities, and services. The Blog module is an independent service that uses service clients to communicate with core services. Provide reference implementation for future developers.
+
+## Stories
+
+### 4.1 Complete Blog Module
+- [Story: 4.1 - Blog Module](./4.1-blog-module.md)
+- **Goal:** Create a complete sample blog module to demonstrate the framework.
+- **Deliverables:** Complete blog module with CRUD operations, permissions, database entities, services, API handlers, and integration tests
+
+## Deliverables Checklist
+- [ ] Blog module directory structure created
+- [ ] Module manifest defines permissions and routes
+- [ ] Blog post domain model defined
+- [ ] Ent schema for blog posts created
+- [ ] Repository implements CRUD operations
+- [ ] Service layer implements business logic
+- [ ] API endpoints for blog posts working
+- [ ] Module integrated with core platform
+- [ ] Integration tests passing
+
+## Acceptance Criteria
+- Blog module can be registered with core platform
+- Permissions are generated for blog module
+- CRUD operations work for blog posts
+- API endpoints require proper authentication
+- Module migrations run on startup
+- Blog posts are associated with users
+- Authorization enforced (users can only edit own posts)