add blueprints

docs/blueprints/04-inventory/32_BPC_ItemCombineSystem.md

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+# BPC_ItemCombineSystem — Item Combine System
+
+**Parent Class:** `ActorComponent`
+**Category:** Inventory
+**Target UE Version:** 5.5–5.7
+**Build Phase:** 3 — Inventory
+
+## 1. Overview
+
+`BPC_ItemCombineSystem` handles item combination and crafting — combining two or more inventory items to create new items. Supports recipe-based combinations, ingredient validation, and result generation.
+
+## 2. Enums
+
+### `E_CombineResult`
+| Value | Description |
+|-------|-------------|
+| `Success` | Items combined successfully |
+| `MissingIngredients` | Not all required items present |
+| `IncompatibleItems` | Items cannot be combined |
+| `InventoryFull` | No space for result item |
+| `RecipeNotFound` | No recipe matches combination |
+
+## 3. Variables
+
+| Variable | Type | Description |
+|----------|------|-------------|
+| `Recipes` | `TArray<DA_RecipeData*>` | Loaded recipe data assets |
+| `CombineCooldown` | `float` | Time between combine operations |
+| `bConsumeIngredients` | `bool` | Remove ingredients on combine |
+
+## 4. Functions
+
+| Function | Description |
+|----------|-------------|
+| `CombineItems` | Attempts to combine two items by slot index |
+| `GetValidRecipes` | Returns all recipes matching current inventory items |
+| `PreviewResult` | Shows result item without consuming ingredients |
+| `CanCombine` | Checks if two items have a valid recipe |
+
+## 5. Event Dispatchers
+
+| Dispatcher | Payload | Description |
+|------------|---------|-------------|
+| `OnCombineSuccess` | `S_InventoryEntry Result` | Items combined |
+| `OnCombineFailed` | `E_CombineResult Reason` | Combination failed |
+| `OnRecipeDiscovered` | `DA_RecipeData Recipe` | New recipe found |
+
+## 6. Dependencies
+
+| System | Relationship |
+|--------|--------------|
+| `BPC_InventorySystem` | Reads and modifies inventory items |
+| `DA_RecipeData` | Recipe definitions |
+
+## 7. Reuse Notes
+- Data-driven recipe system; designers add recipes via data assets