feat: add props system and refactor asset library architecture

tests/unit/assets/prompt-context.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from 'vitest'
+import { buildPromptAssetContext, compileAssetPromptFragments } from '@/lib/assets/services/asset-prompt-context'
+
+describe('asset prompt context', () => {
+  it('compiles subject, environment, and prop prompt fragments from the centralized asset context', () => {
+    const context = buildPromptAssetContext({
+      characters: [
+        {
+          name: '小雨/雨',
+          appearances: [
+            {
+              changeReason: '初始形象',
+              descriptions: ['黑色短发，校服，冷静表情'],
+              selectedIndex: 0,
+              description: 'fallback description',
+            },
+          ],
+        },
+      ],
+      locations: [
+        {
+          name: '天台',
+          images: [
+            {
+              isSelected: true,
+              description: '夜晚天台，冷风，霓虹远景',
+            },
+          ],
+        },
+      ],
+      props: [
+        {
+          name: '青铜匕首',
+          summary: '古旧短刃，雕纹手柄',
+        },
+      ],
+      clipCharacters: [{ name: '雨' }],
+      clipLocation: '天台',
+      clipProps: ['青铜匕首'],
+    })
+
+    expect(compileAssetPromptFragments(context)).toEqual({
+      appearanceListText: '小雨/雨: ["初始形象"]',
+      fullDescriptionText: '【小雨/雨 - 初始形象】黑色短发，校服，冷静表情',
+      locationDescriptionText: '夜晚天台，冷风，霓虹远景',
+      propsDescriptionText: '【青铜匕首】古旧短刃，雕纹手柄',
+      charactersIntroductionText: '暂无角色介绍',
+    })
+  })
+})