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/planning.md

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+# BAT-015 Planning
+
+## Scope
+
+- Implement and verify REQ-019 Docker network MCP deployment.
+- Preserve existing stdio MCP compatibility while enabling `streamable-http` runtime mode.
+- Deploy `jarca-ledger` as an independent Docker service with Synology bind volume.
+- Migrate the existing operating DB from `jarca` to `jarca-ledger` with backup/snapshot evidence.
+- Refresh deployment runbook and baseline docs.
+
+## Design Gate
+
+- Required: yes
+- Rationale: this batch changes runtime topology, deployment ownership, exposed MCP transport, Docker health behavior, and operating DB location. A design/evidence trail is required even though the code diff is small.
+
+## Work plan
+
+1. Add MCP runtime config helpers for stdio/sse/streamable-http transport selection.
+2. Add tests for default stdio, streamable-http env config, and invalid transport rejection.
+3. Add Dockerfile, `.dockerignore`, compose service, healthcheck, and runbook.
+4. Build and run `jarca-ledger` with `/volume1/docker/jarca-ledger/data:/data`.
+5. Verify network MCP using a streamable-http client against `http://192.168.55.253:8000/mcp`.
+6. Snapshot existing `jarca` DB with SQLite backup API, back up the new empty DB, replace `/data/ledger.sqlite3`, restart, and verify table counts/integrity.
+7. Update StagePilot Discovery/SRS/BAT/baseline docs.