feat(admin): 复刻登录页 — boot 过渡动画 + 角色表单

- 搬入 framer-motion，复刻参考项目登录体验
- AICoreEffect：点芯片启动神经链接进度，S-core 数据流点亮，100% 解锁
- AIBanner：青色数据流 + 紫色神经网络背景
- LoginCharacters：四只卡通角色，眼睛跟随鼠标，输密码时遮眼/偷看
- 表单去掉验证码，接现有 login api；账号密码 + 密码显示切换
- 品牌名换 sundynix admin，登录按钮用青蓝渐变

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

admin/package-lock.json

@@ -11,6 +11,7 @@
         "@tailwindcss/typography": "^0.5.20",
         "@tailwindcss/vite": "^4.3.3",
         "clsx": "^2.1.1",
+        "framer-motion": "^12.42.2",
         "lucide-react": "^1.24.0",
         "react": "^19.2.7",
         "react-dom": "^19.2.7",
@@ -1327,6 +1328,33 @@
         }
       }
     },
+    "node_modules/framer-motion": {
+      "version": "12.42.2",
+      "resolved": "https://registry.npmjs.org/framer-motion/-/framer-motion-12.42.2.tgz",
+      "integrity": "sha512-5XY9luDiu0oHfHBjpDthFMh0ES+122w6p/papSJBweMkO8Sn+PW2QaEgRblQBpWFnuvZS5qvarpt/hO2pjGmnw==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-dom": "^12.42.2",
+        "motion-utils": "^12.39.0",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -2588,6 +2616,21 @@
       ],
       "license": "MIT"
     },
+    "node_modules/motion-dom": {
+      "version": "12.42.2",
+      "resolved": "https://registry.npmjs.org/motion-dom/-/motion-dom-12.42.2.tgz",
+      "integrity": "sha512-5gIMWLp/PycBtJRJWRgjxke5n8dlvkSn2DrYW+tr3XcqAZY1xZh6BJyooJXCM8wdfM7wfMjkBJNLge1CKPUIRA==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-utils": "^12.39.0"
+      }
+    },
+    "node_modules/motion-utils": {
+      "version": "12.39.0",
+      "resolved": "https://registry.npmjs.org/motion-utils/-/motion-utils-12.39.0.tgz",
+      "integrity": "sha512-8nadJAJjTtqRkmRF36FoJTrywK9nnFmnPwnSMyxaOCU7GDjN9RTMJIxx9De8ErM+vpPhMccr/6fo5WciyQLnMQ==",
+      "license": "MIT"
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -3072,8 +3115,7 @@
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-      "license": "0BSD",
-      "optional": true
+      "license": "0BSD"
     },
     "node_modules/typescript": {
       "version": "6.0.3",