feat: deploy jarca ledger network mcp service

- add Docker deployment for independent jarca-ledger container
- enable FastMCP streamable-http runtime configuration
- document dcy-013, REQ-019, and BAT-015 verification evidence
- update structure/runtime baselines and deployment runbook

docs/batches/bat-015_20260707_docker-network-mcp-deployment/index.md

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+# BAT-015 Docker network MCP deployment
+
+- Profile: standard
+- Status: release-candidate
+- Included REQ: REQ-019
+- Discovery: dcy-013
+- Owner: 렛저장인
+- Date (KST): 2026-07-07
+
+## 목표
+
+REQ-019에 따라 `jarca-ledger`를 `genichin-agent` 생명주기에서 분리된 독립 Docker service로 배포하고, streamable-http MCP endpoint와 Synology volume 기반 운영 DB를 검증한다.
+
+## 산출물
+
+- FastMCP runtime transport 설정화
+- Dockerfile / `.dockerignore` / `docker-compose.yml`
+- Docker network MCP 배포 runbook
+- 기존 `jarca` 운영 DB 이전
+- pytest, Docker health, MCP smoke, DB integrity/table-count verification