ci(.github/workflows): 拆分 CI 与发布流程。

- 新增独立的 CI 工作流，覆盖前端检查、构建和后端测试。
- 调整 Docker 工作流为仅负责标签发布与镜像构建。
- 同步优化管理页 Issues 图标颜色。

.github/workflows/docker.yml

@@ -1,21 +1,9 @@
-name: CI and Docker
+name: Docker Release
 
 on:
   push:
-    branches:
-      - main
     tags:
       - "v*"
-    paths-ignore:
-      - "**/*.md"
-      - "deploy/.env.example"
-  pull_request:
-    branches:
-      - main
-    paths-ignore:
-      - "**/*.md"
-      - "deploy/.env.example"
-  workflow_dispatch:
 
 permissions:
   contents: read
@@ -72,7 +60,6 @@ jobs:
     name: Resolve release tag
     runs-on: ubuntu-latest
     needs: checks
-    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     outputs:
       tag: ${{ steps.release.outputs.tag }}
       version: ${{ steps.release.outputs.version }}
@@ -94,7 +81,6 @@ jobs:
     name: Build and publish ${{ matrix.name }}
     runs-on: ubuntu-latest
     needs: release
-    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     strategy:
       fail-fast: false
       matrix: