refactor: move source tree into work/, multi-stage Docker build, fix satpass

- Move all application source (meshai/, dashboard-frontend/, tests/,
  config/, docs/, Dockerfile, etc.) into work/ directory
- Add Node.js multi-stage build to Dockerfile for frontend compilation;
  remove compiled static assets from git tracking
- Fix satpass missing time windows: consolidation was splitting wire on
  newline and only putting line 1 in event.title, dropping the time
  window line that the composer uses for precomposed broadcasts
- Fix satpass burst flooding: stagger consolidation timers (+60s per
  pending pass) so Central batch publishes don't blast the mesh
- Update CI workflow build context to work/
- Anchor lib/ and data/ gitignore patterns to repo root to prevent
  false matches on nested directories
- Add dashboard-frontend/node_modules/ to .dockerignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

work/requirements.txt

@@ -0,0 +1,16 @@
+meshtastic>=2.3.0
+pyyaml>=6.0
+aiosqlite>=0.19.0
+openai>=1.0.0
+anthropic>=0.18.0
+google-genai>=1.0.0
+rich>=13.0.0
+httpx>=0.25.0
+fastembed>=0.3.0
+sqlite-vec>=0.1.0
+numpy
+h3>=4.0
+fastapi>=0.110.0
+uvicorn[standard]>=0.27.0
+aiomqtt>=2.0.0
+sgp4>=2.22