chore(assets): 添加建筑和围栏精灵资源

新增游戏资源文件：
- 12 个 Datawhale 房屋建筑精灵（多种样式）
- 2 个围栏瓦片集（木质和铁质）

所有文件名已规范为小写格式

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claude.md

@@ -2,7 +2,7 @@
 
 ## 1. Project Vision & Context
 - **Project**: "WhaleTown" - A 2D top-down pixel art RPG.
-- **Engine**: Godot 4.2+ (Strictly NO Godot 3.x syntax).
+- **Engine**: Godot 4.5+ (Strictly NO Godot 3.x syntax).
 - **Architecture**: Strictly layered: `_Core` (Framework), `Scenes` (Gameplay), `UI` (Interface).
 - **Core Principle**: "Signal Up, Call Down". High decoupling via `EventSystem`.
 
@@ -46,36 +46,40 @@
   const PLAYER_MOVED = "player_moved"
   const INTERACT_PRESSED = "interact_pressed"
   const NPC_TALKED = "npc_talked"
-Singletons: Only GameManager, SceneManager, EventSystem allowed as Autoloads.
-Decoupling: Low-level entities MUST NOT reference GameManager. Use events.
-6. 🏗 Implementation Details
-Player: CharacterBody2D. Must include Camera2D with position_smoothing_enabled = true.
-NPC/Interactables: Use Area2D named InteractionArea. Trigger via EventSystem.
-TileMap Layers:
-Layer 0: Ground (No collision).
-Layer 1: Obstacles (Physics Layer enabled).
-Layer 2: Decoration (Y-Sort enabled).
-Camera: Must auto-calculate limits via TileMap.get_used_rect().
-7. 🧪 Testing Requirements (MANDATORY)
-Coverage: Every Manager/System in _Core/ MUST have a GUT test.
-Naming: Test files must start with test_ and extend GutTest.
-Example:
-code
-Gdscript
-extends GutTest
-func test_event_emission():
-    var sender = Node.new()
-    watch_signals(EventSystem)
-    EventSystem.emit_event(EventNames.PLAYER_MOVED, {})
-    assert_signal_emitted(EventSystem, "event_raised")
-8. 🧘 The Zen of Development
-Juice or Death: Every interaction (UI popup, NPC talk) MUST have a Tween placeholder.
-Zero Magic Numbers: All speeds/timers MUST be @export or defined in Config/.
-Simplicity: If a function does two things, split it.
-Back of the Fence: Hidden logic (like ResponseHandler.gd) must be as clean as the HUD.
-9. 📝 Code Template (Entity Pattern)
-code
-Gdscript
+  ```
+- **Singletons**: Only GameManager, SceneManager, EventSystem allowed as Autoloads.
+- **Decoupling**: Low-level entities MUST NOT reference GameManager. Use events.
+
+## 6. 🏗 Implementation Details
+- **Player**: CharacterBody2D. Must include Camera2D with `position_smoothing_enabled = true`.
+- **NPC/Interactables**: Use Area2D named InteractionArea. Trigger via EventSystem.
+- **TileMap Layers**:
+  - Layer 0: Ground (No collision).
+  - Layer 1: Obstacles (Physics Layer enabled).
+  - Layer 2: Decoration (Y-Sort enabled).
+- **Camera**: Must auto-calculate limits via `TileMap.get_used_rect()`.
+
+## 7. 🧪 Testing Requirements (MANDATORY)
+- **Coverage**: Every Manager/System in `_Core/` MUST have a GUT test.
+- **Naming**: Test files must start with `test_` and extend GutTest.
+- **Example**:
+  ```gdscript
+  extends GutTest
+  func test_event_emission():
+      var sender = Node.new()
+      watch_signals(EventSystem)
+      EventSystem.emit_event(EventNames.PLAYER_MOVED, {})
+      assert_signal_emitted(EventSystem, "event_raised")
+  ```
+
+## 8. 🧘 The Zen of Development
+- **Juice or Death**: Every interaction (UI popup, NPC talk) MUST have a Tween placeholder.
+- **Zero Magic Numbers**: All speeds/timers MUST be `@export` or defined in `Config/`.
+- **Simplicity**: If a function does two things, split it.
+- **Back of the Fence**: Hidden logic (like ResponseHandler.gd) must be as clean as the HUD.
+
+## 9. 📝 Code Template (Entity Pattern)
+```gdscript
 extends CharacterBody2D
 class_name Player