fix: 讯飞鉴权HTTP兼容+AI段落紧凑+对话模式JSON降级

- ReportEditor: 讯飞鉴权改用crypto-js HMAC-SHA256，兼容HTTP非安全环境
- defaultContent.ts+ReportEditor: AI区域<p>标签去掉margin-bottom，段落紧密排布
- ReportEditor: 纯对话模式下JSON解析失败时降级为直接文本回复
- ReportEditor: 对话模式systemPrompt强化JSON格式约束
- deps: 新增crypto-js用于讯飞鉴权

package-lock.json

@@ -10,7 +10,9 @@
       "dependencies": {
         "@google/genai": "^1.29.0",
         "@tailwindcss/vite": "^4.1.14",
+        "@types/crypto-js": "^4.2.2",
         "@vitejs/plugin-react": "^5.0.4",
+        "crypto-js": "^4.2.0",
         "diff": "^9.0.0",
         "dotenv": "^17.2.3",
         "express": "^4.21.2",
@@ -1492,6 +1494,12 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/crypto-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/@types/crypto-js/-/crypto-js-4.2.2.tgz",
+      "integrity": "sha512-sDOLlVbHhXpAUAL0YHDUUwDZf3iN4Bwi4W6a0W0b+QcAezUbRtH4FVb+9J4h+XFPW7l/gQ9F8qC7P+Ec4k8QVQ==",
+      "license": "MIT"
+    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -1904,6 +1912,12 @@
       "integrity": "sha512-NXdYc3dLr47pBkpUCHtKSwIOQXLVn8dZEuywboCOJY/osA0wFSLlSawr3KN8qXJEyX66FcONTH8EIlVuK0yyFA==",
       "license": "MIT"
     },
+    "node_modules/crypto-js": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-4.2.0.tgz",
+      "integrity": "sha512-KALDyEYgpY+Rlob/iriUtjV6d5Eq+Y191A5g4UqLAi8CyGP9N1+FdVbkc1SxKc2r4YAYqG8JzO2KGL+AizD70Q==",
+      "license": "MIT"
+    },
     "node_modules/data-uri-to-buffer": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",