refactor: full-stack restructure with multi-tenancy, workspace management, and K8s diagnostics

- Add Workspace domain (entity, repository, service, handler, DTO)
- Add multi-tenant K8s client with tenant binding and quota management
- Add K8s diagnostics client (instance diagnostics)
- Add authorization middleware (authz package)
- Restructure frontend to feature-based architecture (features/)
- Add User Management page in configuration
- Add AccessDenied page and route guards
- Refactor shared components (form inputs, layout, UI)
- Update Tailwind config for new design system
- Add comprehensive documentation (docs/, tasks/, plans)
- Improve cluster service with better kubeconfig handling
- Add tests for crypto, config, helm client, tenant binding

frontend/tailwind.config.js

@@ -5,21 +5,21 @@ module.exports = {
     extend: {
       colors: {
         dark: {
-          DEFAULT: "#0b1119", // 主背景
-          lighter: "#141c26", // 模块背景
-          elevated: "#1a2533", // 提升层
-          border: "#1f2935", // 分割线
+          DEFAULT: "#f6f8fb", // 主背景
+          lighter: "#ffffff", // 模块背景
+          elevated: "#eef4f8", // 提升层
+          border: "#d8e2ee", // 分割线
         },
         brand: {
-          blue: "#56718f", // 主色（柔和蓝）
-          light: "#6f8aa8", // hover
-          accent: "#c6a15b", // 点缀金色
-          accentLight: "#ddc48b",
+          blue: "#2563eb",
+          light: "#3b82f6",
+          accent: "#0f766e",
+          accentLight: "#14b8a6",
         },
         accent: {
-          teal: "#4d8275",
-          tealLight: "#6ea094",
-          slate: "#2f3947",
+          teal: "#0f766e",
+          tealLight: "#14b8a6",
+          slate: "#475569",
         },
         blue: {
           300: "#6f8aa8",
@@ -42,23 +42,23 @@ module.exports = {
         },
       },
       textColor: {
-        primary: "#e5e9f2", // 主字体
-        secondary: "#aab4c3", // 次级文字
-        muted: "#808ba0",
+        primary: "#142033",
+        secondary: "#4b5b70",
+        muted: "#718096",
       },
       backgroundImage: {
         "app-gradient":
-          "radial-gradient(circle at top, rgba(198, 161, 91, 0.12), transparent 58%), radial-gradient(circle at bottom, rgba(77, 130, 117, 0.18), transparent 62%)",
+          "linear-gradient(180deg, #f9fbfd 0%, #eef4f8 100%)",
       },
       borderRadius: {
         xl: "0.75rem",
         "2xl": "1rem",
       },
       boxShadow: {
-        soft: "0 10px 30px rgba(0, 0, 0, 0.35)",
-        glow: "0 0 25px rgba(198, 161, 91, 0.18)",
+        soft: "0 12px 32px rgba(15, 23, 42, 0.08)",
+        glow: "0 0 0 1px rgba(37, 99, 235, 0.12), 0 16px 42px rgba(37, 99, 235, 0.12)",
       },
     },
   },
   plugins: [],
-};
+};