feat: 初始化 AstroResearch 核心系统代码及重构技术文档

.env.example

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+# AstroResearch Configuration Template
+# Copy this to .env and fill in your details
+
+# NASA ADS API Key (Get from ui.adsabs.harvard.edu)
+ADS_API_KEY=your_ads_api_key_here
+
+# LLM Translation Provider Settings (OpenAI-compatible endpoints)
+LLM_API_KEY=your_llm_api_key_here
+LLM_API_BASE=https://api.deepseek.com/v1
+# Examples: deepseek-chat, gpt-4o-mini, gemini-1.5-flash
+LLM_MODEL=deepseek-chat
+
+# Qiniu Cloud Storage Config (For hosting PDF-extracted layout images)
+QINIU_AK=your_qiniu_access_key_here
+QINIU_SK=your_qiniu_secret_key_here
+QINIU_BUCKET=your_bucket_name
+QINIU_DOMAIN=http://your_cdn_domain.com
+
+# MinerU PDF Layout Extractor Remote API (If not using HTML)
+MINERU_API_URL=http://mineru.remote-api.com/api/v1/extract
+MINERU_API_KEY=your_mineru_api_key
+
+# Local Data Paths
+LIBRARY_DIR=./library
+PORT=8000
+DATABASE_URL=sqlite://astro_research.db