chore: import upstream snapshot with attribution

packaging/deeptutor-cli/README.md

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+# deeptutor-cli
+
+CLI-only DeepTutor distribution. It installs the `deeptutor` command and the
+Python modules required for terminal workflows, RAG, document parsing, and model
+provider integrations, but it does not ship the packaged Next.js Web assets or
+FastAPI/Uvicorn server dependencies used by `deeptutor start`.
+
+Install from the repository root when you want a local CLI-only environment:
+
+```bash
+python3 -m venv .venv-cli
+source .venv-cli/bin/activate
+python -m pip install --upgrade pip
+python -m pip install -e ./packaging/deeptutor-cli
+```
+
+Keep the checkout in place after installation because editable installs point
+the `deeptutor` command at these source files.

packaging/deeptutor-cli/pyproject.toml

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+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "deeptutor-cli"
+dynamic = ["version"]
+description = "CLI-only distribution for DeepTutor"
+requires-python = ">=3.11"
+readme = "README.md"
+license = {text = "Apache-2.0"}
+dependencies = [
+    "PyYAML>=6.0",
+    "jinja2>=3.1.0",
+    "openai>=1.30.0",
+    "tiktoken>=0.5.0",
+    "aiohttp>=3.9.4",
+    "httpx>=0.27.0",
+    "requests>=2.32.2",
+    "ddgs>=9.9.1",
+    "nest_asyncio>=1.5.8",
+    "tenacity>=8.0.0",
+    "pydantic>=2.0.0",
+    "pydantic-settings>=2.0.0",
+    "aiosqlite>=0.19.0",
+    "typer[all]>=0.9.0",
+    "rich>=13.0.0",
+    "prompt_toolkit>=3.0.36",
+    "anthropic>=0.30.0",
+    "dashscope>=1.14.0",
+    "perplexityai>=0.1.0",
+    "oauth-cli-kit>=0.1.1",
+    "llama-index>=0.14.12",
+    "llama-index-retrievers-bm25>=0.7.1,<0.8.0",
+    # FAISS vector store: ANN retrieval replacing SimpleVectorStore brute force for
+    # large KBs (issue #552); imported lazily with SimpleVectorStore fallback.
+    "llama-index-vector-stores-faiss>=0.4.0,<1.0.0",
+    "faiss-cpu>=1.8.0,<2.0.0",
+    "PyMuPDF>=1.26.0",
+    "numpy>=1.24.0,<3.0.0",
+    "arxiv>=2.0.0",
+    "python-docx>=1.1.0",
+    "openpyxl>=3.1.0",
+    "python-pptx>=1.0.0",
+    "pypdf>=4.0.0",
+    "defusedxml>=0.7.1",
+]
+
+[project.scripts]
+deeptutor = "deeptutor_cli.main:main"
+
+[tool.setuptools]
+package-dir = {"" = "../.."}
+include-package-data = false
+
+[tool.setuptools.dynamic]
+version = {attr = "deeptutor.__version__.__version__"}
+
+[tool.setuptools.packages.find]
+where = ["../.."]
+include = ["deeptutor*", "deeptutor_cli*"]
+exclude = ["deeptutor_web*"]