feat: 导出Excel多sheet，按标签分页

- 文件名：精油配方YYYY-MM-DD.xlsx
- 第一个sheet"全部"包含所有配方
- 每个标签一个单独的sheet
- 使用SheetJS生成真正的xlsx格式

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package-lock.json

@@ -12,7 +12,8 @@
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         "pinia": "^2.3.1",
         "vue": "^3.5.32",
-        "vue-router": "^4.6.4"
+        "vue-router": "^4.6.4",
+        "xlsx": "^0.18.5"
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@@ -1179,6 +1180,15 @@
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+      "license": "Apache-2.0",
+      "engines": {
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@@ -1637,6 +1647,19 @@
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+      "resolved": "https://registry.npmjs.org/cfb/-/cfb-1.2.2.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
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+        "crc-32": "~1.2.0"
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@@ -1761,6 +1784,15 @@
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@@ -2571,6 +2603,15 @@
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+      "license": "Apache-2.0",
+      "engines": {
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@@ -4684,6 +4725,18 @@
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+      "resolved": "https://registry.npmjs.org/ssf/-/ssf-0.11.2.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
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+      },
+      "engines": {
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       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.18.0.tgz",
@@ -5490,6 +5543,24 @@
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+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/word": {
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+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
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       "license": "ISC"
     },
+    "node_modules/xlsx": {
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+      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.18.5.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "adler-32": "~1.3.0",
+        "cfb": "~1.2.1",
+        "codepage": "~1.15.0",
+        "crc-32": "~1.2.1",
+        "ssf": "~0.11.2",
+        "wmf": "~1.0.1",
+        "word": "~0.3.0"
+      },
+      "bin": {
+        "xlsx": "bin/xlsx.njs"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
     "node_modules/xml-name-validator": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",