refactor: 移除前端 Mock API，新增共享组件，优化认证流程

- 删除 mock_api_client、mock_calendar_service、mock_history_service
- 新增 fixed_length_code_input、link_button、message_composer 共享组件
- 优化登录/注册/密码重置页面使用新组件
- 简化 injection.dart 移除 mock 分支
- 更新 env.dart 配置（BACKEND_URL 替换 API_URL）
- 后端 agentscope 工具和测试更新
- 重构 AGENTS.md 文档结构
- 新增 deploy/ 目录和 protocol 文档

deploy/build-prod-image.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+IMAGE_NAME="${SOCIAL_BACKEND_IMAGE:-social-app-backend:prod}"
+OUTPUT_FILE="$ROOT_DIR/deploy/social-app-backend-prod.tar.gz"
+
+echo "[1/2] Building image: ${IMAGE_NAME}"
+docker build -t "${IMAGE_NAME}" -f "$ROOT_DIR/backend/Dockerfile" "$ROOT_DIR"
+
+docker image inspect "${IMAGE_NAME}" >/dev/null
+
+echo "[2/2] Exporting image archive: ${OUTPUT_FILE}"
+docker save "${IMAGE_NAME}" | gzip > "${OUTPUT_FILE}"
+
+echo "Done"
+echo "Image: ${IMAGE_NAME}"
+echo "Archive: ${OUTPUT_FILE}"