Phase 1.2: Entity & Config Architecture

The goal of this step is to define all entity types and supporting configuration for workflows, nodes, and execution context. This will form the foundation of FlowDrop's data model.

#3538798: 1.2.1. Define Workflow Entity
#3538799: 1.2.2. Define Flowdrop Node Type Entity
#3538800: 1.2.3. Define Node Instance Representation
#3538801: 1.2.4. Define Job/Execution Entity (Optional in Phase 1)
#3538802: 1.2.5. Configuration and Schema Definitions
#3538803: 1.2.6. Initial Tests