refactor(admin): 管理后台 UI - 独立设计系统并与用户端隔离

把后台 token、Ant 主题、壳层控件和抽屉弹窗从用户工作台拆开，去掉树状侧栏装饰线，色板仍用原来的中性黑白台阶。

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/pages/admin/theme/admin-ant-theme.ts

@@ -0,0 +1,156 @@
+import type { ThemeConfig } from "antd";
+import { theme as antdTheme } from "antd";
+
+/** Isolated Ant Design theme for the admin console. Does not read product skins. */
+export function getIsolatedAdminAntTheme(dark: boolean): ThemeConfig {
+    const text = dark ? "#f5f5f5" : "#111111";
+    const textSecondary = dark ? "#c4c4c4" : "#525252";
+    const canvas = dark ? "#0f0f0f" : "#f5f5f5";
+    const surface = dark ? "#181818" : "#ffffff";
+    const surfaceMuted = dark ? "#222222" : "#f6f6f6";
+    const border = dark ? "rgba(245, 245, 245, 0.12)" : "rgba(17, 17, 17, 0.12)";
+    const primary = dark ? "#f5f5f5" : "#111111";
+    const primaryFg = dark ? "#0f0f0f" : "#ffffff";
+    const hover = dark ? "#ffffff" : "#2a2a2a";
+    const active = dark ? "#d4d4d4" : "#404040";
+    const danger = dark ? "#f87171" : "#dc2626";
+    const success = dark ? "#4ade80" : "#15803d";
+    const warning = dark ? "#fbbf24" : "#b45309";
+    const info = dark ? "#60a5fa" : "#2563eb";
+    const switchOn = dark ? "#22c55e" : "#16a34a";
+    const switchOff = dark ? "#3f4b5a" : "#cbd5e1";
+
+    return {
+        algorithm: dark ? antdTheme.darkAlgorithm : antdTheme.defaultAlgorithm,
+        cssVar: { key: `admin-console-${dark ? "dark" : "light"}` },
+        token: {
+            fontFamily: 'ui-sans-serif, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif',
+            fontSize: 13,
+            fontSizeSM: 12,
+            borderRadius: 6,
+            borderRadiusLG: 8,
+            borderRadiusSM: 4,
+            controlHeight: 32,
+            controlHeightSM: 28,
+            controlHeightLG: 36,
+            lineWidth: 1,
+            colorPrimary: primary,
+            colorPrimaryHover: hover,
+            colorPrimaryActive: active,
+            colorText: text,
+            colorTextSecondary: textSecondary,
+            colorTextTertiary: textSecondary,
+            colorBgBase: canvas,
+            colorBgContainer: surface,
+            colorBgElevated: surface,
+            colorBgLayout: canvas,
+            colorBorder: border,
+            colorBorderSecondary: border,
+            colorSuccess: success,
+            colorWarning: warning,
+            colorError: danger,
+            colorInfo: info,
+            colorLink: text,
+            colorLinkHover: hover,
+            boxShadow: "none",
+            boxShadowSecondary: dark ? "0 22px 56px rgba(0, 0, 0, 0.48)" : "0 16px 40px rgba(15, 23, 42, 0.16)",
+            motionDurationFast: "0.12s",
+            motionDurationMid: "0.12s",
+            motionDurationSlow: "0.18s",
+        },
+        components: {
+            Button: {
+                borderRadius: 6,
+                fontWeight: 550,
+                paddingInline: 12,
+                paddingInlineSM: 8,
+                primaryShadow: "none",
+                dangerShadow: "none",
+                defaultBg: surface,
+                defaultColor: text,
+                defaultBorderColor: border,
+                defaultHoverBg: surfaceMuted,
+                defaultHoverColor: text,
+                defaultHoverBorderColor: border,
+                primaryColor: primaryFg,
+            },
+            Input: {
+                borderRadius: 6,
+                activeShadow: "none",
+                paddingInline: 10,
+                activeBg: surface,
+                hoverBg: surface,
+            },
+            InputNumber: {
+                borderRadius: 6,
+                activeShadow: "none",
+                activeBg: surface,
+                hoverBg: surface,
+            },
+            Select: {
+                borderRadius: 6,
+                optionPadding: "7px 10px",
+                optionSelectedBg: surfaceMuted,
+                optionActiveBg: surfaceMuted,
+            },
+            Switch: {
+                colorPrimary: switchOn,
+                colorPrimaryHover: switchOn,
+                colorTextQuaternary: switchOff,
+                colorTextTertiary: switchOff,
+            },
+            Table: {
+                headerBg: surfaceMuted,
+                headerColor: textSecondary,
+                headerSplitColor: "transparent",
+                borderColor: border,
+                rowHoverBg: surfaceMuted,
+                cellPaddingBlock: 6,
+                cellPaddingBlockMD: 6,
+                cellPaddingBlockSM: 4,
+                cellPaddingInline: 12,
+                cellPaddingInlineSM: 8,
+            },
+            Tabs: {
+                horizontalItemPadding: "8px 0",
+                itemColor: textSecondary,
+                itemSelectedColor: text,
+                inkBarColor: text,
+            },
+            Drawer: {
+                colorBgElevated: surface,
+                paddingLG: 16,
+            },
+            Modal: {
+                borderRadiusLG: 8,
+                contentBg: surface,
+                headerBg: surface,
+            },
+            Tooltip: {
+                borderRadius: 6,
+                colorBgSpotlight: dark ? "#f5f5f5" : "#111111",
+                colorTextLightSolid: dark ? "#0f0f0f" : "#ffffff",
+            },
+            Dropdown: {
+                borderRadiusLG: 8,
+                controlItemBgHover: surfaceMuted,
+                paddingBlock: 4,
+            },
+            Form: {
+                itemMarginBottom: 14,
+            },
+            Segmented: {
+                itemSelectedBg: surface,
+                trackBg: surfaceMuted,
+            },
+            Card: {
+                boxShadow: "none",
+                boxShadowTertiary: "none",
+            },
+            Message: {
+                borderRadiusLG: 8,
+                contentPadding: "8px 14px",
+            },
+        },
+    };
+}