fix: TinyMCE 恢复自托管 + GPL license_key 解决激活问题

- 恢复 tinymceScriptSrc 自托管引用 (/tinymce/tinymce.min.js)
- 添加 license_key: 'gpl' 支持内网部署免激活
- 恢复 public/tinymce/ 和 .gitignore 规则

web/.gitignore

@@ -9,6 +9,7 @@ lerna-debug.log*
 
 node_modules
 dist
+public/tinymce
 dist-ssr
 *.local
 

web/src/pages/TemplateEditor.tsx

@@ -309,12 +309,13 @@ export default function TemplateEditor() {
             </Button>
           )}
           <Editor
-            apiKey="no-api-key"
+            tinymceScriptSrc="/tinymce/tinymce.min.js"
             onInit={handleEditorInit}
             value={htmlContent}
             init={{
               height: "100%",
               menubar: true,
+              license_key: "gpl",
               plugins: [
                 "advlist", "autolink", "lists", "link", "image",
                 "charmap", "preview", "anchor", "searchreplace",