chore: 加 oxlint，现存 19 条 warning 清零

原来只有 Prettier，没有任何 lint。根目录加 `bun run lint`（oxlint，覆盖后端、前端、
契约，--deny-warnings：有一条就算失败），CLAUDE.md 常用检查里加上。

现存 19 条顺手清掉：
- 11 处未使用的 import / catch 参数 / 回调参数
- oj/store/problem.ts：`...problem.value?.languages` 展开可能是 undefined
  （外层 if 已经保证非空，去掉 ?.）
- admin/problem/detail.vue：`contestId = contestId` 自赋值，删掉
- judge/sql/engine.ts：注释里的 `/*x*/` 示例原来靠零宽空格防止提前闭合注释，
  改成 `*\/`
- 其余：多余的 !!、new Array(n)、展开里多余的 `|| {}`

两边类型检查、前端构建、后端单二进制编译都过。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/admin/problem/components/AstRulesEditor.vue

@@ -162,7 +162,7 @@ function getRulesForLang(lang: string): AstRule[] {
 }
 
 function updateRules(lang: string, rules: AstRule[]) {
-  const current = { ...(props.modelValue || {}) }
+  const current = { ...props.modelValue }
   if (rules.length === 0) {
     delete current[lang]
   } else {

apps/web/src/admin/problem/detail.vue

@@ -266,9 +266,6 @@ async function getProblemDetail() {
         code: "",
       }))
     }
-    if (problem.value.contestId) {
-      problem.value.contestId = problem.value.contestId
-    }
 
     // 下面是用来显示的：
     // 代码模板 和 模板开关

apps/web/src/admin/user/generate.vue

@@ -30,7 +30,7 @@ function generateUsers() {
     )
     return false
   }
-  let className = !!prefix.value ? `ks${prefix.value}` : ""
+  let className = prefix.value ? `ks${prefix.value}` : ""
   // 占位邮箱必须全站唯一：注册、编辑用户、导入三条路都查重，而且库里同一个邮箱
   // 出现两次的话，那两个账号在「编辑用户」里保存一次就撞 409，从此改不动。
   // 原来只按「班级 + 批内序号」拼，同一个班分两批导入必然重号 —— 加一段每批随机的

apps/web/src/main.ts

@@ -55,7 +55,7 @@ router.beforeEach(async (to, _from, next) => {
     if (!userStore.user) {
       try {
         await userStore.getMyProfile()
-      } catch (error) {
+      } catch {
         next("/")
         return
       }
@@ -85,7 +85,7 @@ router.beforeEach(async (to, _from, next) => {
 
 app.mount("#app")
 
-if (!!import.meta.env.PUBLIC_ICONIFY_URL) {
+if (import.meta.env.PUBLIC_ICONIFY_URL) {
   addAPIProvider("", {
     resources: [import.meta.env.PUBLIC_ICONIFY_URL],
   })

apps/web/src/oj/contest/components/LineChart.vue

@@ -113,7 +113,7 @@ const chartData = computed(() => {
       if (b.solved !== a.solved) return b.solved - a.solved
       return a.penalty - b.penalty
     })
-    const ranks = new Array(topUsers.length).fill(0)
+    const ranks = Array.from({ length: topUsers.length }, () => 0)
     indexed.forEach((item, pos) => {
       ranks[item.i] = pos + 1
     })

apps/web/src/oj/problem/components/EditorForTest.vue

@@ -12,7 +12,7 @@ import { copyToClipboard } from "utils/functions"
 
 const message = useMessage()
 const route = useRoute()
-const contestID = !!route.params.contestID ? route.params.contestID : null
+const contestID = route.params.contestID ? route.params.contestID : null
 
 const codeStore = useCodeStore()
 const problemStore = useProblemStore()

apps/web/src/oj/store/contest.ts

@@ -106,7 +106,7 @@ export const useContestStore = defineStore("contest", () => {
   async function _getProblems(contestID: string) {
     try {
       problems.value = await getContestProblems(contestID)
-    } catch (err) {
+    } catch {
       problems.value = []
       toggleAccess(false)
     }

apps/web/src/oj/store/problem.ts

@@ -29,7 +29,7 @@ export const useProblemStore = defineStore("problem", () => {
 
   const languages = computed<LANGUAGE[]>(() => {
     if (route.name === "problem" && problem.value?.allowFlowchart) {
-      return ["Flowchart", ...problem.value?.languages]
+      return ["Flowchart", ...problem.value.languages]
     }
     return problem.value?.languages ?? []
   })

apps/web/src/shared/store/loginSummary.ts

@@ -34,7 +34,7 @@ export const useLoginSummaryStore = defineStore("loginSummary", () => {
       summary.value = res.summary
       analysis.value = res.analysis || ""
       analysisError.value = res.analysisError || ""
-    } catch (err) {
+    } catch {
       analysisError.value = "获取登录统计失败，请稍后再试"
     } finally {
       loading.value = false

apps/web/src/utils/stream.ts

@@ -47,7 +47,7 @@ export async function consumeJSONEventStream<T = any>(
     let parsed: T
     try {
       parsed = JSON.parse(payloadStr)
-    } catch (error) {
+    } catch {
       throw new Error(`无法解析服务端事件数据: ${payloadStr}`)
     }