Tile-Server-Spike: /tiles StaticFiles-Mount + tiles/ vom Tar/Git ausschließen

- main.py: geschützter /tiles-Mount (TILES_DIR, No-Op ohne Verzeichnis), Range-Requests via Starlette FileResponse
- Makefile: tiles/ aus TAR_EXCLUDE (546MB pmtiles nicht ins Staging-Tar)
- .gitignore: *.pmtiles/*.osm.pbf/tiles-build ausschließen

Makefile

@@ -24,6 +24,7 @@ TAR_EXCLUDE := --exclude='.git' \
                --exclude='./backend/__pycache__' \
                --exclude='./.env' \
                --exclude='./*.db' \
+               --exclude='./tiles' \
                --exclude='./.DS_Store'
 
 .PHONY: help deploy deploy-clean staging release sync push restart build stop status \