Alpha stage commit

.env.example

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+# SQLite is the default for the prototype. It keeps the project runnable without Docker.
+DATABASE_URL=sqlite:///./data/workbench.sqlite
+# For large imports, use PostgreSQL/PostGIS instead:
+# DATABASE_URL=postgresql://USER:PASSWORD@localhost:5432/meubility
+# POSTGRES_USE_SIDECARS=false
+DATA_DIR=./data
+GTFS_STOP_TIMES_IMPORT_LIMIT=250000
+
+# Start separate queue worker processes from the API server lifespan.
+# Workers survive normal server restarts by default; stale leases are recovered.
+QUEUE_WORKER_AUTOSTART=true
+QUEUE_WORKER_COUNT=1
+QUEUE_WORKER_POLL_INTERVAL_SECONDS=2
+QUEUE_JOB_LEASE_SECONDS=7200
+QUEUE_WORKER_STOP_ON_SHUTDOWN=false
+
+# Chunk sizes for queued data-preparation jobs.
+ROUTE_MATCHING_BATCH_SIZE=100
+ROUTE_LAYER_OSM_ROUTE_BATCH_SIZE=1000
+ROUTE_LAYER_OSM_STOP_BATCH_SIZE=5000