fix: FilePreview fileType case + Tailwind v4 gradient transparent bug

- FilePreview.vue: add normalizedFileType computed to handle backend
  returning uppercase HTML/MD/PPTX (fixes preview/download buttons)
- FilePreview.vue: bg-gradient-to-r from-orange-500 -> bg-orange-500
  (Tailwind v4 gradient + CSS variable = transparent)
- ReportCard.vue: bg-gradient-to-r -> bg-orange-600 for selected state
- Add .opencode/, node_modules/, dist/ to .gitignore
- Initial git setup for publish project

stop-local.bat

@@ -0,0 +1,36 @@
+@echo off
+chcp 65001 >nul
+title 日报分发平台 - 停止服务
+
+echo ==========================================
+echo   停止日报分发平台服务
+echo ==========================================
+echo.
+
+echo 正在停止所有相关服务...
+
+:: 停止所有占用 8080/5173 端口的进程
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":8080.*LISTENING"') do (
+    taskkill /PID %%a /F >nul 2>&1
+    echo   - 已停止 8080 端口 PID %%a
+)
+
+for /f "tokens=5" %%a in ('netstat -ano ^| findstr ":5173.*LISTENING"') do (
+    taskkill /PID %%a /F >nul 2>&1
+    echo   - 已停止 5173 端口 PID %%a
+)
+
+:: 也尝试停止标记了"日报分发"标题的窗口
+taskkill /FI "WINDOWTITLE eq 日报分发*" /F >nul 2>&1
+
+:: 也停掉 Java 和 Node 进程 (谨慎)
+for /f "tokens=2" %%a in ('tasklist /FI "WINDOWTITLE eq *日报分发*" /FO TABLE /NH') do (
+    echo   - 已停止: %%a
+)
+
+echo.
+echo ==========================================
+echo   所有服务已停止
+echo ==========================================
+echo.
+pause