docs: verify and update Epic 1 story statuses to Completed

- Verified all acceptance criteria for Stories 1.1-1.6
- Updated Status fields from Pending to Completed
- Marked all acceptance criteria checkboxes as completed
- All stories in Epic 1 are now fully implemented and verified

docs/content/stories/epic0/README.md

@@ -31,11 +31,11 @@ Initialize repository structure with proper Go project layout, implement configu
 - **Deliverables:** DI container, FX providers, application entry point, lifecycle management
 
 ## Deliverables Checklist
-- [ ] Repository structure in place
-- [ ] Configuration system loads YAML files and env vars
-- [ ] Structured logging works
-- [ ] CI pipeline runs linting and builds binary
-- [ ] Basic DI container initialized
+- [x] Repository structure in place
+- [x] Configuration system loads YAML files and env vars
+- [x] Structured logging works
+- [x] CI pipeline runs linting and builds binary
+- [x] Basic DI container initialized
 
 ## Acceptance Criteria
 - `go build ./cmd/platform` succeeds