feat: add bidirectional ICO image converter

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package-lock.json

@@ -7,7 +7,6 @@
     "": {
       "name": "file-converter",
       "version": "0.1.0",
-      "hasInstallScript": true,
       "dependencies": {
         "@prisma/client": "^6.19.3",
         "docx": "^9.7.1",
@@ -16,6 +15,7 @@
         "express": "^5.2.1",
         "express-rate-limit": "^8.6.1",
         "file-type": "^22.0.1",
+        "icojs": "^1.0.0",
         "mammoth": "^1.12.0",
         "markdown-it": "^15.0.0",
         "multer": "^2.2.0",
@@ -47,6 +47,12 @@
         "url": "https://github.com/sponsors/Borewit"
       }
     },
+    "node_modules/@canvas/image-data": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@canvas/image-data/-/image-data-1.1.0.tgz",
+      "integrity": "sha512-QdObRRjRbcXGmM1tmJ+MrHcaz1MftF2+W7YI+MsphnsCrmtyfS0d5qJbk0MeSbUeyM/jCb0hmnkXPsy026L7dA==",
+      "license": "MIT"
+    },
     "node_modules/@emnapi/core": {
       "version": "2.0.0-alpha.3",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-2.0.0-alpha.3.tgz",
@@ -2056,6 +2062,12 @@
       "integrity": "sha512-iD3898SR7sWVRHbiQv+sHUtHnMvC1o3nW5rAcqnq3uOn07DSAppZYUkIGslDz6gXC7HfunPe7YVBgoEJASPcHA==",
       "license": "MIT"
     },
+    "node_modules/bmp-ts": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/bmp-ts/-/bmp-ts-1.0.9.tgz",
+      "integrity": "sha512-cTEHk2jLrPyi+12M3dhpEbnnPOsaZuq7C45ylbbQIiWgDFZq4UVYPEY5mlqjvsj/6gJv9qX5sa+ebDzLXT28Vw==",
+      "license": "MIT"
+    },
     "node_modules/body-parser": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
@@ -2690,6 +2702,33 @@
         }
       }
     },
+    "node_modules/decode-bmp": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/decode-bmp/-/decode-bmp-0.2.1.tgz",
+      "integrity": "sha512-NiOaGe+GN0KJqi2STf24hfMkFitDUaIoUU3eKvP/wAbLe8o6FuW5n/x7MHPR0HKvBokp6MQY/j7w8lewEeVCIA==",
+      "license": "MIT",
+      "dependencies": {
+        "@canvas/image-data": "^1.0.0",
+        "to-data-view": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=8.6.0"
+      }
+    },
+    "node_modules/decode-ico": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/decode-ico/-/decode-ico-0.4.1.tgz",
+      "integrity": "sha512-69NZfbKIzux1vBOd31al3XnMnH+2mqDhEgLdpygErm4d60N+UwA5Sq5WFjmEDQzumgB9fElojGwWG0vybVfFmA==",
+      "license": "MIT",
+      "dependencies": {
+        "@canvas/image-data": "^1.0.0",
+        "decode-bmp": "^0.2.0",
+        "to-data-view": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=8.6"
+      }
+    },
     "node_modules/deepmerge-ts": {
       "version": "7.1.5",
       "resolved": "https://registry.npmjs.org/deepmerge-ts/-/deepmerge-ts-7.1.5.tgz",
@@ -3637,6 +3676,22 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/icojs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/icojs/-/icojs-1.0.0.tgz",
+      "integrity": "sha512-Ksd2dSS9PlN/KX2iymij7cBCa5aWOhqlZ0GMamRInCHMBlWYxyQQMfr/aURywO7psO49w8vrJGnHkySfxVKmVw==",
+      "license": "MIT",
+      "dependencies": {
+        "bmp-ts": "^1.0.9",
+        "decode-ico": "^0.4.1",
+        "file-type": "^22.0.1",
+        "jpeg-js": "^0.4.4",
+        "pngjs": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=22.22.2"
+      }
+    },
     "node_modules/iconv-lite": {
       "version": "0.7.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.7.3.tgz",
@@ -3778,6 +3833,12 @@
         "jiti": "lib/jiti-cli.mjs"
       }
     },
+    "node_modules/jpeg-js": {
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/jpeg-js/-/jpeg-js-0.4.4.tgz",
+      "integrity": "sha512-WZzeDOEtTOBK4Mdsar0IqEU5sMr3vSV2RqkAIzUEV2BHnUfKGyswWFPFwK5EeDo93K3FohSHbLAjj0s1Wzd+dg==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/js-yaml": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.3.0.tgz",
@@ -5048,6 +5109,15 @@
         }
       }
     },
+    "node_modules/pngjs": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
+      "integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.19.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.24",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.24.tgz",
@@ -5937,6 +6007,12 @@
         "node": ">=14.14"
       }
     },
+    "node_modules/to-data-view": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/to-data-view/-/to-data-view-1.1.0.tgz",
+      "integrity": "sha512-1eAdufMg6mwgmlojAx3QeMnzB/BTVp7Tbndi3U7ftcT2zCZadjxkkmLmd97zmaxWi+sgGcgWrokmpEoy0Dn0vQ==",
+      "license": "MIT"
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",