Initial MVP for QA asset backend

hy_qa_asset_backend/.env.example

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+DATABASE_URL=
+OPENAI_API_KEY=
+OPENAI_BASE_URL=
+MODEL_NAME=gpt-4.1-mini
+
+FEISHU_APP_ID=
+FEISHU_APP_SECRET=
+FEISHU_APP_TOKEN=
+# If the Base URL is under /wiki/<token>, set FEISHU_WIKI_NODE_TOKEN instead of FEISHU_APP_TOKEN.
+FEISHU_WIKI_NODE_TOKEN=
+FEISHU_TABLE_ID_SESSION=
+FEISHU_TABLE_ID_RAW_QA=
+FEISHU_TABLE_ID_STANDARD_QA=
+
+SCHEDULE_CRON=0 1 * * *
+SCHEDULE_TIMEZONE=Asia/Shanghai
+
+MOCK_MODE=true