feat: AI 即时分析计费/共识/校准与 Docker 前端构建

- 即时分析：先扣费、防重入(429)、失败退款；记忆库与离线校准 worker
- 多周期共识、客观分与设置项 AI_ANALYSIS_CONSENSUS_TIMEFRAMES
- Docker：前端多阶段构建(QuantDinger-Vue-src)、根目录 .dockerignore、compose 调整
- 同步 frontend/dist 静态资源

Made-with: Cursor

frontend/Dockerfile

@@ -1,12 +1,32 @@
-# QuantDinger Frontend - Pre-built Static Files
-# No build step needed - dist/ is already compiled.
+# QuantDinger Frontend — multi-stage build
+# Build context: repository root (see docker-compose.yml)
+#
+# Stage 1: compile Vue app from QuantDinger-Vue-src
+# Stage 2: nginx static + API reverse proxy (nginx.conf)
+
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Layer cache: deps only
+COPY QuantDinger-Vue-src/package.json QuantDinger-Vue-src/package-lock.json ./
+RUN npm ci
+
+COPY QuantDinger-Vue-src/ ./
+
+# Match local production build (`npm run build` in QuantDinger-Vue-src)
+ENV NODE_OPTIONS=--max_old_space_size=4096
+RUN npm run build
+
+# --- runtime ---
+
 FROM nginx:1.25-alpine
 
-# Copy pre-built frontend files
-COPY dist/ /usr/share/nginx/html/
+# curl: docker-compose healthcheck
+RUN apk add --no-cache curl
 
-# Copy nginx configuration
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=builder /app/dist /usr/share/nginx/html/
+COPY frontend/nginx.conf /etc/nginx/conf.d/default.conf
 
 EXPOSE 80