feat: add AntV diagrams + Leaflet maps

[OchnikBartek]

Summary

Adds AntV diagram sidecar + Leaflet map rendering to the generated template, with reliability fixes for MCP tooling across all 6 AI frameworks.

Changes

• Add enable_antv_charts cookiecutter variable gating AntV MCP sidecar, diagram tools, and Leaflet map rendering
• Add create_map tool with MapMarker typed schema — prevents empty-marker validation errors from weaker models (GPT-4.5 etc.)
• Wire create_map into all 6 framework assistants with typed signatures for JSON schema fidelity
• Add render-once prompt nudge for maps, charts, and AntV diagrams (fixes Opus re-render duplicate bug)
• Fix MCP connection leak in CrewAI: get_antv_crewai_tools memoizes the started adapter so it's started once per process, not once per request
• Fix per-request event-loop blocking in LangChain/LangGraph/DeepAgents: memoize tool discovery so _run_sync only blocks on first request
• Fix antvis-chart Docker healthcheck: plain wget rejected by streamable-HTTP endpoint → replaced with node one-liner
• Add coordinate bounds validation to MapSpec._validate_center (matches per-marker validation)
• Remove dead parse_map_spec export
• Add react-leaflet map renderer in frontend (MapMessage, MapLeaflet components)
• Add AntV image renderer in tool-call-card.tsx
• Add matrix test entries for pydantic_ai, langchain, crewai with enable_antv_charts and enable_charts
• Add TestGeneratedTemplateAntvCharts content tests verifying typed markers, bounds check, cache variables, and absence of removed dead code

Testing

• Matrix tests: generated pydantic_ai / langchain / crewai / pydantic_deep with --antv-charts; all render, compile, pass ruff
• TestGeneratedTemplateAntvCharts content tests: MapMarker present, bounds check present, parse_map_spec absent, list[MapMarker] in assistant, module-level cache in antv_chart.py
• Typed-marker fix verified via LangChain smoke test (dict markers coerced, empty markers rejected)
• All tests pass locally: make test
• Linting passes: make lint
• Type checking passes: make typecheck
• Generated projects still work: tested with at least one preset

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
fastapi_gen/prompts.py	90.90%	1 Missing ⚠️

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[DEENUU1]

Solid, well-documented feature — the per-framework MCP wiring, graceful degradation, typed MapMarker schema, and the dedicated content tests are all nicely done. A few things worth addressing before merge: a doc/compose mismatch around the production compose, publishing the unauthenticated MCP port to the host in prod, and two edge cases in the tool-discovery memoization (thread-safety race + permanent caching of a transient failure). Inline comments below.