feat(config): wire MinerU and material RAG settings

Add MINERU_* / MATERIAL_* to config loader, .env.example, and
compose env passthrough. Secrets stay in local .env only.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.test.yml

@@ -97,6 +97,13 @@ services:
       RERANKER_ENDPOINT_URL: ${RERANKER_ENDPOINT_URL:-}
       RERANKER_MODEL: ${RERANKER_MODEL:-bge-reranker-v2-m3-free}
       RERANKER_API_KEY: ${RERANKER_API_KEY:-}
+      MINERU_ENDPOINT_URL: ${MINERU_ENDPOINT_URL:-https://mineru.net}
+      MINERU_API_KEY: ${MINERU_API_KEY:-}
+      MINERU_MODEL_VERSION: ${MINERU_MODEL_VERSION:-vlm}
+      MINERU_LANGUAGE: ${MINERU_LANGUAGE:-ch}
+      MINERU_TIMEOUT: ${MINERU_TIMEOUT:-90s}
+      MATERIAL_FULLTEXT_MAX_BYTES: ${MATERIAL_FULLTEXT_MAX_BYTES:-61440}
+      MATERIAL_RAG_TOP_K: ${MATERIAL_RAG_TOP_K:-8}
       ADMIN_USERNAME: ${ADMIN_USERNAME:-admin}
       ADMIN_PASSWORD: ${ADMIN_PASSWORD:?required}
       AUTH_REGISTRATION_ENABLED: ${AUTH_REGISTRATION_ENABLED:-true}