refactor(grades,diagnostic): 成绩和学情诊断模块审计修复

P0-1: 10 个页面补充 requirePermission 权限校验
P0-2: diagnostic/data-access-reports.ts 移除直查 users 表，改用 getUserNamesByIds
P0-3: 新增 grade/grades/diagnostic 三组 i18n 翻译文件（zh-CN/en）
P0-4: 新增 /management/grade 重定向页面

P1-2: 抽取 toNumber/normalize/buildScopeClassFilter 到 lib/grade-utils.ts
P1-3: 为 12 个 Action 新增 Zod safeParse 校验（schema.ts +12 查询 schema）
P1-4: 修复 as 断言违规，改用类型守卫函数

P2-2: 移除 diagnostic 组件中 Tailwind 任意值

同步更新架构图文档 004 和 005

src/modules/diagnostic/components/class-diagnostic-view.tsx

@@ -131,7 +131,7 @@ export function ClassDiagnosticView({ summary }: ClassDiagnosticViewProps) {
                   className={`flex flex-col items-center justify-center rounded-md px-3 py-2 text-white ${masteryColor(kp.averageMastery)}`}
                   title={`${kp.knowledgePointName}: ${kp.averageMastery.toFixed(1)}% (mastered ${kp.masteredCount}/${kp.totalStudents})`}
                 >
-                  <span className="max-w-[120px] truncate text-xs font-medium">
+                  <span className="max-w-32 truncate text-xs font-medium">
                     {kp.knowledgePointName}
                   </span>
                   <span className="text-sm font-bold">{kp.averageMastery.toFixed(0)}%</span>
@@ -252,7 +252,7 @@ export function ClassDiagnosticView({ summary }: ClassDiagnosticViewProps) {
                   type="month"
                   value={period}
                   onChange={(e) => setPeriod(e.target.value)}
-                  className="w-[180px]"
+                  className="w-44"
                 />
               </div>
               <Button onClick={handleGenerate} disabled={isGenerating}>

src/modules/diagnostic/components/mastery-radar-chart.tsx

@@ -42,7 +42,7 @@ export function MasteryRadarChart({ data }: MasteryRadarChartProps) {
         domain={[0, 100]}
         tickCount={5}
         showLegend={hasClassAverage}
-        heightClassName="mx-auto h-[360px] w-full max-w-[520px]"
+        heightClassName="mx-auto h-96 w-full max-w-lg"
         gridStrokeDasharray="4 4"
         series={[
           {

src/modules/diagnostic/components/student-diagnostic-view.tsx

@@ -195,7 +195,7 @@ export function StudentDiagnosticView({ summary, reports, classAverageMastery }:
                       <span className="text-sm font-medium">
                         {r.period ?? "Untitled period"}
                       </span>
-                      <Badge variant="outline" className="text-[10px]">
+                      <Badge variant="outline" className="text-xs">
                         {r.reportType}
                       </Badge>
                     </div>