feat: implement 6 pending features

[rahuliitk]

Summary

• Vision Engine Deployment: Dockerfile + docker-compose service on port 8010, removed floor-plan amber warning
• Global Building Codes: Added US IRC 2021 (20 rules), EU Eurocode (15 rules), UK Building Regs (15 rules) with multi-jurisdiction compliance UI dropdown
• Change Orders UI: Full dashboard page with summary cards, status filter tabs, create/approve/reject flow, and impact analysis
• IFC/BIM Export: ifcopenshell-based IFC4 writer generating IfcWall/Door/Window/Furniture, integrated into drawing pipeline with download button
• Visual Product Matching ML: 6 modules — CLIP ViT-B/32 embedder (512-dim), pgvector indexer/searcher, VLM reranker (GPT-4o-mini), orchestration pipeline with graceful degradation
• Photo-to-3D Reconstruction: tRPC router + vision-engine backend with VLM depth estimation, calibrated measurement, glTF mesh generation, and full UI page with confidence scores

Test plan

• Vision Engine: docker compose build vision-engine && docker compose up vision-engine — verify /health returns 200
• Building Codes: Navigate to Compliance page, switch jurisdiction between IN/US/EU/GB, verify rules load
• Change Orders: Navigate to Change Orders page, create/approve/reject orders, verify summary cards
• IFC Export: Generate drawings, verify IFC download button appears and .ifc file downloads
• Product Matching: cd ml/product-matching && pip install -e ".[db]" — verify CLIP embedder loads
• Reconstruction: Navigate to Reconstruction page, start a reconstruction job, verify dimension extraction

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