docs: add mkdocs, update links, add architecture documentation

docs/content/stories/phase5/5.1.2-create-pkginfracachecachego-interface.md

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+# Task 5.1.2: Create `pkg/infra/cache/cache.go` interface:
+
+## Metadata
+- **Task ID**: 5.1.2
+- **Title**: Create `pkg/infra/cache/cache.go` interface:
+- **Phase**: 5 - Infrastructure Adapters
+- **Section**: 5.1
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: TBD
+- **Dependencies**: TBD
+
+## Description
+Create `pkg/infra/cache/cache.go` interface:
+
+## Requirements
+- Create `pkg/infra/cache/cache.go` interface:
+
+## Implementation Steps
+1. TODO: Add implementation steps
+2. TODO: Add implementation steps
+3. TODO: Add implementation steps
+
+## Acceptance Criteria
+- [ ] Task 5.1.2 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 Cache interface {
+      Get(ctx context.Context, key string) ([]byte, error)
+      Set(ctx context.Context, key string, value []byte, ttl time.Duration) error
+      Delete(ctx context.Context, key string) error
+  }
+```