replace main with lightweight memory gateway

.env.example

@@ -0,0 +1,16 @@
+# EverOS HTTP server used by the gateway client.
+EVEROS_BASE_URL=http://127.0.0.1:1995
+
+# Gateway-owned SQLite database. This does not point at EverOS internal storage.
+MEMORY_GATEWAY_DB_PATH=./data/memory_gateway.sqlite3
+
+# Raw uploaded files are stored here before being passed to EverOS by file URI.
+MEMORY_GATEWAY_STORAGE_DIR=./data/storage
+
+# Number of resource session IDs sent per EverOS search request.
+MEMORY_GATEWAY_RESOURCE_SEARCH_BATCH_SIZE=50
+
+# API server settings used by python main.py.
+MEMORY_GATEWAY_HOST=0.0.0.0
+MEMORY_GATEWAY_PORT=8010
+MEMORY_GATEWAY_RELOAD=false