chore: update labels in bug report template (#221)

* chore: update labels in bug report template

* chore: update label in feature template

* chore: update label for new sources

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -2,7 +2,7 @@ name: Bug Report
 description: 提交错误报告
 title: 'Bug: '
 labels:
-  - bug
+  - ':bug: bug'
 body:
   - type: textarea
     attributes:

.github/ISSUE_TEMPLATE/feature.yml

@@ -2,7 +2,7 @@ name: Feature Request
 description: 提交功能请求
 title: 'Feature: '
 labels:
-  - feature
+  - ':cake: feature'
 body:
   - type: dropdown
     id: sources

.github/ISSUE_TEMPLATE/new-source.yml

@@ -2,7 +2,7 @@ name: New Source Request
 description: 添加新图源支持请求
 title: 'Feature: New Source'
 labels:
-  - feature
+  - ':watermelon: new source'
 body:
   - type: markdown
     attributes: