refactor(server): user_agent/steward/ocr 等服务重构并适配关联任务

- user_agent 拆分 application/locations/knowledge/response/review 四个子模块，接入申请位置语义与关联草稿分支
- steward planner/runtime/slot/plan_builder 决策链路重构，travel_reimbursement_calculator/orchestrator_expense_query 适配
- ocr/document_preview/document_intelligence/receipt_folder 复用预览与资产缓存，expense_claim_draft_flow/application_handoff 适配
- pyproject.toml 新增依赖，paddleocr bootstrap 脚本与 server_start.sh 调整
- 更新差旅/交通/通信等财务规则表，同步 document_intelligence/ocr/receipt_folder/user_agent 等测试

server/scripts/bootstrap_paddleocr_gpu.sh

@@ -14,7 +14,7 @@ if ! command -v "${PYTHON_BIN}" >/dev/null 2>&1; then
 fi
 
 apt-get update
-apt-get install -y --no-install-recommends libgl1 libglib2.0-0 poppler-utils poppler-data
+apt-get install -y --no-install-recommends libgl1 libglib2.0-0 poppler-utils poppler-data mupdf-tools
 
 rm -rf "${OCR_VENV_DIR}"
 "${PYTHON_BIN}" -m venv "${OCR_VENV_DIR}"