docs: add mkdocs, update links, add architecture documentation

docs/content/stories/phase5/5.1.6-add-cache-middleware-for-selected-routes-optional.md

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+# Task 5.1.6: Add cache middleware for selected routes (optional)
+
+## Metadata
+- **Task ID**: 5.1.6
+- **Title**: Add cache middleware for selected routes (optional)
+- **Phase**: 5 - Infrastructure Adapters
+- **Section**: 5.1
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: TBD
+- **Dependencies**: TBD
+
+## Description
+Add cache middleware for selected routes (optional)
+
+## Requirements
+- Add cache middleware for selected routes (optional)
+
+## Implementation Steps
+1. TODO: Add implementation steps
+2. TODO: Add implementation steps
+3. TODO: Add implementation steps
+
+## Acceptance Criteria
+- [ ] Task 5.1.6 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 ./...
+```
+