refactor(postcss): 将 CSS 处理收口到 @weapp-tailwindcss/postcss - #1206
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主包不再直接依赖 postcss-scss、@csstools/css-tokenizer 和 lightningcss， 相关 API 与仓库约束一并落到 postcss 包。
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把 hoist/create border preflight 和 preflight import / vendor keyframes 清理从主包挪到 @weapp-tailwindcss/postcss，主包只保留模板注入与生成编排。
把 selector/unit 兼容、@apply 清理、空 CSS 块扫描以及 class style value 编译从主包挪到 @weapp-tailwindcss/postcss。Vite marker 去重仍留在主包。
sonofmagic
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uni-app Vite 构建在大量无 escape 的 @import 上不必每次走 tokenizer。 复杂输入（注释、escape、残缺引号）仍回退到 @csstools/css-tokenizer。
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摘要
把 CSS 语法解析、tokenize 和存量 CSS AST 变换收到
@weapp-tailwindcss/postcss。weapp-tailwindcss不再直接依赖postcss-scss、@csstools/css-tokenizer和未使用的lightningcss。变更
packages/postcss/src/syntax/：parseCssImportSpecifier、quoteCssImportSpecifier、parseScssSource、parseUniAppXStyleSourceparseTailwindCssDirectiveRequest改为 tokenizer 实现@apply清理、空块扫描、Harmony CSS style valuetest/ci/architecture-contract.test.ts禁止主包再引入 CSS 处理库@reference路径解析和生成编排验证
pnpm --filter @weapp-tailwindcss/postcss testpnpm --filter weapp-tailwindcss exec vitest run test/ci/architecture-contract.test.ts test/tailwindcss/v4-import-paths.test.ts test/core.test.ts test/uni-app-x test/postcss test/bundlers/css-imports.test.ts test/bundlers/shared/generator-css/legacy-selectors.test.ts test/bundlers/shared/generator-css/legacy-compat.test.ts test/bundlers/final-css-cleanup.unit.test.ts test/tailwindcss/v4-engine.test.tspnpm --filter @weapp-tailwindcss/postcss buildpnpm agents:check