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

.dockerignore

@@ -0,0 +1,17 @@
+# Used when build context is the repo root (e.g. frontend image).
+# Backend builds use backend_api_python/.dockerignore with its own context.
+
+.git
+**/.git
+.DS_Store
+
+# Do not send local node_modules / build outputs (Docker runs npm ci + build)
+QuantDinger-Vue-src/node_modules
+QuantDinger-Vue-src/dist
+
+# Pre-built copy used for local nginx tests only — image builds from source
+frontend/dist
+
+# Backend & DB not needed for frontend stage
+backend_api_python
+docker-compose.override.yml