Add EGE support prototype v0.1.0

.env.example

@@ -0,0 +1,16 @@
+# Local demo. Copy to .env and run: node --env-file=.env server.mjs
+SUPPORT_MODE=demo
+SUPPORT_PORT=8787
+
+# Optional path to a different SQLite database.
+# SUPPORT_DB=data/support.sqlite
+
+# Yandex AI Studio. To use the model, set SUPPORT_MODE=llm above.
+# SUPPORT_PROVIDER=yandex
+# YANDEX_FOLDER_ID=
+# YANDEX_API_KEY=
+
+# Website integration. Keep both tokens on the server.
+# SUPPORT_WEB_ORIGIN=https://school.example
+# SUPPORT_STAFF_TOKEN=
+# SUPPORT_SITE_TOKEN=