Add project introduction PDF for BrainDance (流光·记)

[Copilot]

Adds a 12-page A4 project introduction PDF (docs/BrainDance_项目介绍.pdf) covering the full scope of the BrainDance spatial memory engine.

Content Structure

• Cover — project name, tagline, key tech stack at a glance
• Value proposition — anti-entropy narrative across micro (personal memory), macro (urban archiving), and temporal (future-proof radiance field) dimensions
• Architecture — four-component Supabase BaaS design; table comparing traditional middleware vs. BrainDance replacements (Redis → SKIP LOCKED, ChromaDB → pgvector, etc.)
• Core features — Spatial RAG query flow, 8-step end-to-end pipeline (capture → GLOMAP → 3DGS → Qwen-VL → pgvector)
• Tech stack tables — AI/ML (3DGS, SAM3D, SHARP, GLOMAP, Qwen-VL) and infrastructure (Flutter, Supabase, Deno, Docker)
• System workflow — 4-phase sequence (upload → realtime feedback → async GPU compute → browse/search) with DB schema summary
• Quick start — environment requirements + 3-step launch (Supabase → AI Worker → Flutter)
• Technology frontier — timeline of integrated research (SIGGRAPH 2023 → Meta SAM3D 2025.11 → Apple SHARP 2025.12 → BrainDance 2026)
• References & acknowledgements

Rendering

Uses embedded WenQuanYi Micro Hei TTF (wqy-microhei.ttc) via ReportLab for correct CJK rendering across all PDF viewers without requiring local font installation.

Preview

Cover	Table of Contents	Content Page

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