chore(config): 初始化项目配置与部署基础

.env.example

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+DJANGO_SECRET_KEY=replace-with-a-local-secret-key
+DJANGO_DEBUG=true
+DJANGO_ALLOWED_HOSTS=*
+
+# OpenAI-compatible LLM API
+LLM_API_KEY=your_llm_api_key
+LLM_BASE_URL=https://api.openai.com/v1
+LLM_MODEL=gpt-4.1-mini
+
+# Embedding model for RAG
+# Leave EMBEDDING_API_KEY empty to reuse LLM_API_KEY if desired.
+EMBEDDING_API_KEY=
+EMBEDDING_BASE_URL=
+EMBEDDING_MODEL=text-embedding-3-small
+
+SCENARIO_CONFIG_DIR=configs
+UPLOAD_ROOT=data/uploads
+CHROMA_PATH=data/chroma