fix: 修复工程类型双重标签和自定义标签无法点击的问题

- 移除 CreateProjectModal/ProjectConfigPanel 中外层重复的"工程类型"标签
- CustomTagsEditor 标签 pill 改为 button，点击整个 pill 即可移除标签

frontend/src/components/CreateProjectModal.tsx

@@ -91,9 +91,6 @@ export default function CreateProjectModal({
         </label>
 
         <div style={{ marginBottom: 16 }}>
-          <span style={{ display: 'block', fontSize: 13, fontWeight: 600, marginBottom: 8, color: 'var(--text-secondary)' }}>
-            工程类型
-          </span>
           <StyleSelector
             value={style}
             onChange={handleStyleChange}

frontend/src/components/CustomTagsEditor.tsx

@@ -32,8 +32,10 @@ export default function CustomTagsEditor({ style, onChange }: CustomTagsEditorPr
       </div>
       <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginBottom: 8 }}>
         {tags.map(tag => (
-          <span
+          <button
             key={tag}
+            type="button"
+            onClick={() => onChange(removeCustomTag(style, tag))}
             style={{
               display: 'inline-flex',
               alignItems: 'center',
@@ -43,25 +45,21 @@ export default function CustomTagsEditor({ style, onChange }: CustomTagsEditorPr
               borderRadius: 999,
               background: 'var(--bg-input)',
               border: '1px solid var(--border)',
+              color: 'var(--text-primary)',
+              cursor: 'pointer',
             }}
           >
             {tag}
-            <button
-              type="button"
+            <span
               style={{
-                background: 'transparent',
-                border: 'none',
                 color: 'var(--text-muted)',
                 fontSize: 14,
-                padding: 0,
                 lineHeight: 1,
-                cursor: 'pointer',
               }}
-              onClick={() => onChange(removeCustomTag(style, tag))}
             >
               x
-            </button>
-          </span>
+            </span>
+          </button>
         ))}
       </div>
       <div style={{ display: 'flex', gap: 8 }}>

frontend/src/components/ProjectConfigPanel.tsx

@@ -73,9 +73,6 @@ export default function ProjectConfigPanel() {
       </div>
 
       <div style={{ flex: 1, overflow: 'auto', padding: '12px 16px' }}>
-        <div style={{ fontSize: 13, fontWeight: 600, marginBottom: 8, color: 'var(--text-secondary)' }}>
-          工程类型
-        </div>
         <StyleSelector
           value={draftStyle}
           onChange={updateDraft}