chore: import upstream snapshot with attribution

lightrag_webui/env.local.sample

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+VITE_BACKEND_URL=http://localhost:9621
+VITE_API_PROXY=true
+VITE_API_ENDPOINTS=/api,/documents,/graphs,/graph,/health,/query,/docs,/redoc,/openapi.json,/login,/auth-status
+
+# LightRAG WebUI — runtime configuration template.
+#
+# IMPORTANT: VITE_API_PREFIX and VITE_WEBUI_PREFIX have been removed. The
+# browser-visible URL prefixes are now resolved at REQUEST time from the
+# backend's LIGHTRAG_API_PREFIX and LIGHTRAG_WEBUI_PATH (see project root
+# `env.example`). One WebUI build is reusable across any number of
+# reverse-proxy prefixes / Docker instances — no per-site rebuild needed.
+#
+# How it works:
+# - Build artifacts contain `<!-- __LIGHTRAG_RUNTIME_CONFIG__ -->` and use
+#   relative asset URLs (`./assets/...`).
+# - On each request, the FastAPI server replaces the placeholder with
+#   `<script>window.__LIGHTRAG_CONFIG__ = { apiPrefix, webuiPrefix }</script>`.
+# - The SPA reads `window.__LIGHTRAG_CONFIG__` for `axios.baseURL`, fetch
+#   templates, and in-app links.
+#
+# This file only needs to define dev-server proxy settings; copy to `.env`
+# if you also want to run `bun run dev` from a deployed checkout.
+#
+# For dev-time multi-site simulation (running `bun run dev` against a
+# backend that is already configured with a site prefix), use
+# `VITE_DEV_API_PREFIX` and `VITE_DEV_WEBUI_PREFIX` — see
+# `env.development.smaple`.
+#
+# End-to-end deployment guide: docs/MultiSiteDeployment.md