chore(deps): 移除未使用 npm 依赖

移除已无引用的依赖包：@react-three/postprocessing, pixelmatch,
pngjs, @types/dompurify, @types/pngjs, @types/uuid

Author: Aparencia

client/package-lock.json

@@ -38,7 +38,6 @@
     "@radix-ui/react-toast": "^1.2.19",
     "@react-three/drei": "^9.122.0",
     "@react-three/fiber": "^8.18.0",
-    "@react-three/postprocessing": "^2.19.1",
     "@supabase/supabase-js": "^2.110.1",
     "@tanstack/react-query": "^5.101.2",
     "@tanstack/react-virtual": "^3.14.5",
@@ -72,8 +71,6 @@
     "lxgw-wenkai-lite-webfont": "^1.7.0",
     "node-edge-tts": "^1.2.10",
     "pdf-parse": "^2.4.5",
-    "pixelmatch": "^7.2.0",
-    "pngjs": "^7.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^7.18.1",
@@ -92,13 +89,10 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@types/better-sqlite3": "^7.6.0",
-    "@types/dompurify": "^3.0.5",
     "@types/node": "^24.13.2",
-    "@types/pngjs": "^6.0.5",
     "@types/react": "^18.3.18",
     "@types/react-dom": "^18.3.5",
     "@types/three": "^0.185.1",
-    "@types/uuid": "^10.0.0",
     "@vitejs/plugin-react": "^6.0.3",
     "@vitest/coverage-v8": "^4.1.10",
     "autoprefixer": "^10.5.2",