feat: 품목기준관리 Zustand 리팩토링 및 422 에러 팝업

- Zustand store 도입 (useItemMasterStore)
- 훅 분리 및 구조 개선 (hooks/, contexts/)
- 422 ValidationException 에러 AlertDialog 팝업 추가
- API 함수 분리 (src/lib/api/item-master.ts)
- 타입 정의 정리 (item-master.types.ts, item-master-api.ts)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package-lock.json

@@ -40,6 +40,7 @@
         "clsx": "^2.1.1",
         "cmdk": "^1.1.1",
         "date-fns": "^4.1.0",
+        "immer": "^11.0.1",
         "lucide-react": "^0.552.0",
         "next": "^15.5.9",
         "next-intl": "^4.4.0",
@@ -52,7 +53,7 @@
         "tailwind-merge": "^3.3.1",
         "vaul": "^1.1.2",
         "zod": "^4.1.12",
-        "zustand": "^5.0.8"
+        "zustand": "^5.0.9"
       },
       "devDependencies": {
         "@playwright/test": "^1.57.0",
@@ -3443,6 +3444,16 @@
         }
       }
     },
+    "node_modules/@reduxjs/toolkit/node_modules/immer": {
+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-10.2.0.tgz",
+      "integrity": "sha512-d/+XTN3zfODyjr89gM3mPq1WNX2B8pYsu7eORitdwyA2sBubnTl3laYlBk4sXY5FUa5qTZGBDPJICVbvqzjlbw==",
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/immer"
+      }
+    },
     "node_modules/@remirror/core-constants": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@remirror/core-constants/-/core-constants-3.0.0.tgz",
@@ -6912,9 +6923,9 @@
       }
     },
     "node_modules/immer": {
-      "version": "10.2.0",
-      "resolved": "https://registry.npmjs.org/immer/-/immer-10.2.0.tgz",
-      "integrity": "sha512-d/+XTN3zfODyjr89gM3mPq1WNX2B8pYsu7eORitdwyA2sBubnTl3laYlBk4sXY5FUa5qTZGBDPJICVbvqzjlbw==",
+      "version": "11.0.1",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-11.0.1.tgz",
+      "integrity": "sha512-naDCyggtcBWANtIrjQEajhhBEuL9b0Zg4zmlWK2CzS6xCWSE39/vvf4LqnMjUAWHBhot4m9MHCM/Z+mfWhUkiA==",
       "license": "MIT",
       "funding": {
         "type": "opencollective",
@@ -8887,6 +8898,16 @@
         "react-is": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "node_modules/recharts/node_modules/immer": {
+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-10.2.0.tgz",
+      "integrity": "sha512-d/+XTN3zfODyjr89gM3mPq1WNX2B8pYsu7eORitdwyA2sBubnTl3laYlBk4sXY5FUa5qTZGBDPJICVbvqzjlbw==",
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/immer"
+      }
+    },
     "node_modules/redux": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
@@ -10104,9 +10125,9 @@
       }
     },
     "node_modules/zustand": {
-      "version": "5.0.8",
-      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.8.tgz",
-      "integrity": "sha512-gyPKpIaxY9XcO2vSMrLbiER7QMAMGOQZVRdJ6Zi782jkbzZygq5GI9nG8g+sMgitRtndwaBSl7uiqC49o1SSiw==",
+      "version": "5.0.9",
+      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.9.tgz",
+      "integrity": "sha512-ALBtUj0AfjJt3uNRQoL1tL2tMvj6Gp/6e39dnfT6uzpelGru8v1tPOGBzayOWbPJvujM8JojDk3E1LxeFisBNg==",
       "license": "MIT",
       "engines": {
         "node": ">=12.20.0"