diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 54a6279..482547c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   backend-lint-test:
     runs-on: ubuntu-latest
@@ -48,7 +52,7 @@ jobs:
       - name: Lint (ruff)
         run: cd backend && ruff check app/
 
-      - name: Type check (optional)
+      - name: Style check (ruff)
         run: cd backend && ruff check app/ --select=E,W
         continue-on-error: true
 
diff --git a/.github/workflows/pr-check.yml b/.github/workflows/pr-check.yml
index 425831f..783adbc 100644
--- a/.github/workflows/pr-check.yml
+++ b/.github/workflows/pr-check.yml
@@ -5,6 +5,10 @@ on:
     branches: [main, develop]
     types: [opened, synchronize, reopened]
 
+concurrency:
+  group: pr-check-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   pr-lint-test:
     name: Lint & Test (PR)
@@ -49,9 +53,11 @@ jobs:
           pip install ruff pytest-cov
 
       - name: Backend lint
+        id: backend-lint
         run: cd backend && ruff check app/
 
       - name: Backend tests
+        id: backend-tests
         env:
           DATABASE_URL: postgresql+asyncpg://test:test@localhost:5432/geo_test
           REDIS_URL: redis://localhost:6379/0
@@ -72,12 +78,15 @@ jobs:
         run: cd frontend && npm ci
 
       - name: Frontend lint
+        id: frontend-lint
         run: cd frontend && npm run lint
 
       - name: Frontend type check
+        id: frontend-type-check
         run: cd frontend && npx tsc --noEmit
 
       - name: Frontend unit tests
+        id: frontend-tests
         run: cd frontend && npm run test:ci
 
       # ── PR 状态注释 ──────────────────────────────────
@@ -89,7 +98,7 @@ jobs:
             const { context, github } = require('@actions/github');
             const status = '${{ job.status }}';
             const emoji = status === 'success' ? '✅' : '❌';
-            const body = `## CI 检查结果 ${emoji}\n\n**状态**: ${status}\n\n| 检查项 | 状态 |\n|--------|------|\n| 后端 Lint | ${{ steps.Backend lint.outcome || 'N/A' }} |\n| 后端测试 | ${{ steps.Backend tests.outcome || 'N/A' }} |\n| 前端 Lint | ${{ steps.Frontend lint.outcome || 'N/A' }} |\n| 前端测试 | ${{ steps.Frontend unit tests.outcome || 'N/A' }} |`;
+            const body = `## CI 检查结果 ${emoji}\n\n**状态**: ${status}\n\n| 检查项 | 状态 |\n|--------|------|\n| 后端 Lint | ${{ steps.backend-lint.outcome || 'N/A' }} |\n| 后端测试 | ${{ steps.backend-tests.outcome || 'N/A' }} |\n| 前端 Lint | ${{ steps.frontend-lint.outcome || 'N/A' }} |\n| 前端测试 | ${{ steps.frontend-tests.outcome || 'N/A' }} |`;
             github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,