build(ci): 建立单仓工具链与质量门禁

统一 pnpm 10 + Node 24.15.0 + Turborepo 单仓，落地 ESLint 9 flat、Prettier、commitlint、husky 与 Gitea CI，作为后续批次的一致门禁。

turbo.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "ui": "stream",
+  "tasks": {
+    "build": {
+      "dependsOn": ["^build"],
+      "outputs": ["dist/**"]
+    },
+    "dev": {
+      "cache": false,
+      "persistent": true
+    },
+    "typecheck": {
+      "dependsOn": ["^build"]
+    },
+    "test": {
+      "dependsOn": ["^build"],
+      "outputs": ["coverage/**"]
+    },
+    "test:int": {
+      "dependsOn": ["^build"],
+      "cache": false
+    }
+  }
+}