docs: add mkdocs, update links, add architecture documentation

docs/content/stories/phase4/4.3.1-create-modulesbloginternaldomainpostgo.md

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+# Task 4.3.1: Create `modules/blog/internal/domain/post.go`:
+
+## Metadata
+- **Task ID**: 4.3.1
+- **Title**: Create `modules/blog/internal/domain/post.go`:
+- **Phase**: 4 - Sample Feature Module (Blog)
+- **Section**: 4.3
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: TBD
+- **Dependencies**: TBD
+
+## Description
+Create `modules/blog/internal/domain/post.go`:
+
+## Requirements
+- Create `modules/blog/internal/domain/post.go`:
+
+## Implementation Steps
+1. TODO: Add implementation steps
+2. TODO: Add implementation steps
+3. TODO: Add implementation steps
+
+## Acceptance Criteria
+- [ ] Task 4.3.1 is completed
+- [ ] All requirements are met
+- [ ] Code compiles and tests pass
+
+## Related ADRs
+- See relevant ADRs in `docs/adr/`
+
+## Implementation Notes
+- TODO: Add implementation notes
+
+## Testing
+```bash
+# TODO: Add test commands
+go test ./...
+```
+
+
+## Code Reference
+
+```go
+type Post struct {
+      ID        string
+      Title     string
+      Content   string
+      AuthorID  string
+      CreatedAt time.Time
+      UpdatedAt time.Time
+  }
+```