feat(blueprint): add Schema type system and @BlueprintArray decorator

- Add Schema fluent API for defining complex data types
- Add @BlueprintArray decorator for array properties with itemSchema
- Support primitive types: float, int, string, boolean, vector2, vector3
- Support composite types: object, array, enum, ref
- Add path-utils for nested property access
- Update documentation with examples and usage guide

.changeset/blueprint-schema-system.md

@@ -0,0 +1,18 @@
+---
+"@esengine/blueprint": minor
+---
+
+feat(blueprint): add Schema type system and @BlueprintArray decorator
+
+- Add `Schema` fluent API for defining complex data types:
+  - Primitive types: `Schema.float()`, `Schema.int()`, `Schema.string()`, `Schema.boolean()`, `Schema.vector2()`, `Schema.vector3()`
+  - Composite types: `Schema.object()`, `Schema.array()`, `Schema.enum()`, `Schema.ref()`
+  - Support for constraints: `min`, `max`, `step`, `defaultValue`, `placeholder`, etc.
+
+- Add `@BlueprintArray` decorator for array properties:
+  - `itemSchema`: Define schema for array items using Schema API
+  - `reorderable`: Allow drag-and-drop reordering
+  - `exposeElementPorts`: Create individual ports for each array element
+  - `portNameTemplate`: Custom naming for element ports (e.g., "Waypoint {index1}")
+
+- Update documentation with examples and usage guide