feat: v2 Vue3 frontend + multiple optimizations

- New Vue 3 + Vite frontend at /v2/ (OLED dark theme, Fira Sans/Code)
- Date selector: support day/week/month range (backend unchanged)
- SSE auto-reconnect (up to 3 retries)
- Visibility polling pause (dashboard pauses when tab hidden)
- Friendly Chinese HTTP error messages
- Cancel task with confirmation in Dashboard
- Split AiWorkflowService (1700->845 lines):
  - AiApiService: AI API calls + streaming
  - ExcelExportService: POI Excel generation
- Dockerfile: 3-stage build (Node frontend -> Maven -> JRE)
- WebApplication.java: System.out -> Logger
- .gitignore: v2 build output, backup dirs

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -1,19 +1,57 @@
-# syntax=docker/dockerfile:1.7
+# ============================================================
+# Docker 镜像仓库加速（默认使用 docker.1ms.run 国内代理）
+# 如需切换回 Docker Hub：
+#   docker compose build --build-arg REGISTRY_MIRROR=docker.io/library
+# ============================================================
+ARG REGISTRY_MIRROR=docker.1ms.run/library
+
+# ============================================================
+# Stage 1: 前端构建（Vue 3 + Vite）
+# ============================================================
+FROM ${REGISTRY_MIRROR}/node:22-alpine AS frontend-builder
+
+WORKDIR /frontend
+
+COPY frontend-vue/package.json frontend-vue/package-lock.json ./
+
+RUN npm ci
+
+COPY frontend-vue/ ./
+
+RUN npm run build
+
+# ============================================================
+# Stage 2: 后端构建（Maven + Java 8）
+# ============================================================
+FROM ${REGISTRY_MIRROR}/maven:3.9.6-eclipse-temurin-8 AS builder
+
+# Maven JVM 调优：增大堆内存、启用并行
+ENV MAVEN_OPTS="-Xmx2g -XX:MaxMetaspaceSize=512m -Djava.util.concurrent.ForkJoinPool.common.parallelism=4"
 
-FROM maven:3.9.6-eclipse-temurin-8 AS builder
 WORKDIR /app
 
+# 使用阿里云 Maven 镜像加速依赖下载（替换 Maven Central）
+COPY maven-settings.xml /root/.m2/settings.xml
+
 COPY pom.xml .
 
 RUN --mount=type=cache,target=/root/.m2 \
-    mvn -B -DskipTests dependency:go-offline
+    mvn -B -DskipTests -T 1C dependency:go-offline
 
 COPY src ./src
 
-RUN --mount=type=cache,target=/root/.m2 \
-    mvn -B -DskipTests clean package
+# 将前端构建产物注入静态资源目录（Maven 会自动打包进 jar）
+# vite.config.js 中 outDir 为相对 __dirname 的路径，容器内 __dirname=/frontend
+COPY --from=frontend-builder /src/main/resources/static/v2 /app/src/main/resources/static/v2
 
-FROM eclipse-temurin:8-jre
+# -T 1C: 按 CPU 核数并行; -o: 离线模式（依赖已缓存，跳过元数据检查）
+RUN --mount=type=cache,target=/root/.m2 \
+    mvn -B -DskipTests -T 1C -o clean package
+
+# ============================================================
+# Stage 3: 运行镜像（最小化 JRE）
+# ============================================================
+FROM ${REGISTRY_MIRROR}/eclipse-temurin:8-jre-alpine
 WORKDIR /app
 
 COPY --from=builder /app/target/svn-log-tool-1.0.0-jar-with-dependencies.jar app.jar