docs: add mkdocs, update links, add architecture documentation

docs/content/stories/phase2/2.1.5-add-login-endpoint-post-apiv1authlogin.md

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+# Task 2.1.5: Add login endpoint: `POST /api/v1/auth/login`
+
+## Metadata
+- **Task ID**: 2.1.5
+- **Title**: Add login endpoint: `POST /api/v1/auth/login`
+- **Phase**: 2 - Authentication & Authorization
+- **Section**: 2.1
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: TBD
+- **Dependencies**: TBD
+
+## Description
+Add login endpoint: `POST /api/v1/auth/login`
+
+## Requirements
+- Add login endpoint: `POST /api/v1/auth/login`
+
+## Implementation Steps
+1. TODO: Add implementation steps
+2. TODO: Add implementation steps
+3. TODO: Add implementation steps
+
+## Acceptance Criteria
+- [ ] Task 2.1.5 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 ./...
+```
+